US3603100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunnelling means and method
Assignee: LEVERAGED EQUITIES Ltd
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Filing: 1969-05-05
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Granted: 1971-09-07
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Expires: 1989-05-05
Abstract
Abstract A tunnelling machine performs in such a manner that, in a cylindrical tunnel, a radial step from center to periphery advances helically about the axis of the tunnel as material is detached, to advance the locus of the step. A plurality of implements mounted on an arm have a locus corresponding approximately to the desired step direction advance the step by penetrating the material a short distance in advance of the step location and prying it toward the face of the step. Actuation of one or a small proportion of the implements at a time provides large thrust in a concentrated location. Choice of sequence of implement actuation allows compensation for the fact that radially outward parts of the arm advance farther than radially inward parts. Arm advances are alternated with cycles of implement operation. A frame, roller mounted on the walls of the tunnel has the rollers ''skew'' to advance the frame helically as it rotates in the tunnel. The frame supports the implement arm and mounts a supply of permanently deformable strip material which is applied under one of the leading frame support members and corrugated thereby to overlap with preceding and succeeding layers to form temporary reinforcement for the tunnel walls. The rear of the frame may be displaced relative to the tunnel walls and the front of the frame with the implements to change the direction of the tunnel. As an incident of the implement actuation, rocks or rocklike material, too hard for the implements, may be sensed for special treatment.
Inventors
- 👤 John James Cowley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:51
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/10; E21D9/1093; E21D9/106; E21D9/11; E21D9/112; E21D9/115
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
147 words
In a tunnelling machine, a frame, an arm supported forwardly of said frame, for rotatable movement relative to said tunnel in a predetermined sense, a plurality of digging implements mounted on said arm, each of said implements being selectively actuable to cyclically translate between an extended forward and a retracted rearward position relative to said arm, in a direction having in the initial part of the extension direction, a major component parallel to said axis of rotation, each of said implements being controlled to rotate as well as translate toward the end of said translation extension, said rotation being directed to cause the tips of the implements to move with a component in the trailing direction relative to said predetermined arm rotation sense, each of said implements being provided with tips directed in the extension direction to facilitate entrance by said implement into the material being tunnelled.
Claim 2
Dependent Claim
147 words
In a tunnelling machine, a frame, an arm supported forwardly of said frame, for rotatable movement relative to said tunnel in a predetermined sense, a plurality of digging implements mounted on said arm, each of said implements being selectively actuable to cyclically translate between an extended forward and a retracted rearward position relative to said arm, in a direction having in the initial part of the extension direction, a major component parallel to said axis of rotation, each of said implements being controlled to rotate as well as translate toward the end of said translation extension, said rotation being directed to cause the tips of the implements to move with a component in the trailing direction relative to said predetermined arm rotation sense, each of said implements being provided with tips directed in the extension direction to facilitate entrance by said implement into the material being tunnelled.
Claim 3
Dependent Claim
169 words
In a tunnelling machine as claimed in claim 1 wherein said tunnelling means is designed to produce a cylindrical tunnel, a forward set and a rearward set of rollers rotatably mounted on said frame for mounting the frame while rollably supported by the walls of the tunnel, said rollers being mounted to produce an helical advance of said frame in the tunnel on rotation of said frame relative to the tunnel, said rollers being divided into a group associated with the forward end of the frame and a group associated with the rearward end of the frame, said rearward group being mounted on members radially movable relative to said frame over a predetermined range, control members for said radially movable members, a member maintained static relative to said frame, rotatably connected to said frame; means attached to said static member providing a track connected to control the radial translation of said control members relative to said frame, means for adjusting the location of said track relative to said bearing.
Claim 4
Dependent Claim
149 words
In a tunnelling machine as claimed in claim 1 wherein said tunnelling means is designed to produce a cylindrical tunnel a forward set and a rearward set of rollers rotatably mounted on said frame for mounting the frame while rollably supported by the walls of the tunnel, said rollers being mounted and oriented to produce an helical advance of said frame on rotation of said frame relative to the tunnel, said rearward group of rollers being mounted on inwardly extending radial plungers, a static member rotatably mounted on said frame to allow relative rotation about the rotation axis, a member attached to said static member, designed to form a track for the inward end of said plungers and hence to determine the spacing of the axis of rotation of said static members from said tunnel walls, means for adjusting the location of said track relative to said rotation axis.
Claim 5
Dependent Claim
134 words
In a tunnelling machine as claimed in claim 1 wherein said tunnelling means is designed to produce a cylindrical tunnel, rollers rotatably mounted on said frame for supporting the frame while rollably supported by the walls of the tunnel, means for supplying permanently deformable material in continuous strip form, means for guiding said strip for longitudinal movement between one of said rollers and the wall of the tunnel, for movement tangentially of and rollably relative to said rollers, whereby said strip material is applied to the walls in an helical arrangement, the width of the strip material being related to the roller angular orientation to ensure that the successive strip turns overlap on the tunnel wall, at least some of the rollers being designed to corrugate the strip material applied to the tunnel wall.
Claim 6
Dependent Claim
155 words
In a tunnelling machine as claimed in claim 1 wherein said tunnelling means is designed to produce a cylindrical tunnel, a forward and a rearward ring of rollers, each roller being rotatably mounted on said frame, said forward and rearward rings being located to rollably support respectively, the forward and rearward ends of said frame on the cylindrical walls of said tunnel, said roller axes being oriented to produce the helical advance of said frame in said tunnel on rotation of said frame in one direction about the tunnel axis, the rollers in said rearward ring being mounted to be displaceable relative to said frame along radii from the axis of such cylindrical tunnel, and a guide member maintained stationary during rotation of said frame, designed to control said radial displacement of individual rollers relative to the frame as a function of the angular displacement of each said roller about the axis of said tunnel.
Claim 7
Dependent Claim
34 words
In a tunnelling machine as claimed in claim 5 wherein at least said one of said rollers is powered to rotate relative to said frame to impel said frame to rotate in said tunnel.
Claim 8
Dependent Claim
69 words
In a tunnelling machine as claimed in claim 1 including a second arm supported forwardly of said frame for rotatable movement relative to said tunnel along the same locus as said implement mounting arm but angularly displaced therefrom, means allowing the mounting thereon of rock treating implements along radial extents relative to the axis of said rotatable movement corresponding to the corresponding radial extents where said implements are used.
Claim 9
Independent Claim
108 words
A method of tunnelling comprising: impelling an implement towaRd the material being tunnelled while mechanically limiting its movements to provide: that the implement shall move initially in primarily a translatory direction until a predetermined amount of penetration is reached, that the implement shall continue to move with a component in such translatory direction but providing, during said continuing movement, a predetermined rotary component about an axis transverse relative to the translatory direction whereby material on the deflection side of the penetration location of said implement is deflected in a direction transverse relative to said penetration direction, terminating said continuing movement and returning said implement to its original position.
Claim 10
Independent Claim
108 words
A method of tunnelling comprising: impelling an implement towaRd the material being tunnelled while mechanically limiting its movements to provide: that the implement shall move initially in primarily a translatory direction until a predetermined amount of penetration is reached, that the implement shall continue to move with a component in such translatory direction but providing, during said continuing movement, a predetermined rotary component about an axis transverse relative to the translatory direction whereby material on the deflection side of the penetration location of said implement is deflected in a direction transverse relative to said penetration direction, terminating said continuing movement and returning said implement to its original position.
Claim 11
Independent Claim
99 words
A method of tunnelling comprising: locating a plurality of material penetrating implements along a line adjacent the tunnelling face of a wall; selectively causing said implements to follow a cycle comprising: a. moving with primarily a translatory motion to achieve penetration of the material to be tunnelled; b. after achieving a predetermined degree of penetration, continuing said penetration but increasing the rotary component about an axis transverse relative to the translatory direction; whereby material on one side of said implement is deflected in a direction transverse relative to said penetration direction; c. returning said implements to their original position.
Claim 12
Independent Claim
99 words
A method of tunnelling comprising: locating a plurality of material penetrating implements along a line adjacent the tunnelling face of a wall; selectively causing said implements to follow a cycle comprising: a. moving with primarily a translatory motion to achieve penetration of the material to be tunnelled; b. after achieving a predetermined degree of penetration, continuing said penetration but increasing the rotary component about an axis transverse relative to the translatory direction; whereby material on one side of said implement is deflected in a direction transverse relative to said penetration direction; c. returning said implements to their original position.
Claim 13
Dependent Claim
25 words
A method as claimed in claim 9 including: on completion of said cycle, moving said implement in a direction approximately opposite to said transverse direction.
Claim 14
Dependent Claim
145 words
In a tunnelling machine, a frame, means for supporting said frame on a cylindrical tunnel wall, an arm supported on said frame radially extending from and designed for rotary advancing movement in a predetermined sense about the axis of such tunnel wall; implements mounted on said arm over an extent between a radially inward and a radially outward location thereof; means for actuating said implements for extension away from said arm and retraction toward said arm, means causing said elements, during said extension movement, to translate with a major component parallel to said rotation axis; and means for causing said implements, after a predetermined translation, to rotate about an axis causing the implements to be displaced in a direction, opposite to the direction of advance of said arm relative to the translation direction; means for retracting said elements; and means for intermittently advancing said arm.
Claim 15
Dependent Claim
145 words
In a tunnelling machine, a frame, means for supporting said frame on a cylindrical tunnel wall, an arm supported on said frame radially extending from and designed for rotary advancing movement in a predetermined sense about the axis of such tunnel wall; implements mounted on said arm over an extent between a radially inward and a radially outward location thereof; means for actuating said implements for extension away from said arm and retraction toward said arm, means causing said elements, during said extension movement, to translate with a major component parallel to said rotation axis; and means for causing said implements, after a predetermined translation, to rotate about an axis causing the implements to be displaced in a direction, opposite to the direction of advance of said arm relative to the translation direction; means for retracting said elements; and means for intermittently advancing said arm.
Claim 16
Dependent Claim
170 words
In a tunnelling machine as claimed in claim 11 wherein said means for supporting said frame on a cylindrical wall comprises: a forward set and a rearward set of rollers rotatably mounted on said frame for mounting the frame while rollably supported by the walls of the tunnel, said rollers being mounted to produce an helical advance of said frame in the tunnel on rotation of said frame relative to the tunnel, said rollers being divided into a group associated with the forward end of the frame and a group associated with the rearward end of the frame, said rearward group being mounted on members radially movable relative to said frame over a predetermined range, control members for said radially movable members, a member maintained static relative to said frame, rotatably connected to said frame; means attached to said static member providing a track connected to control the radial translation of said control members relative to said frame, means for adjusting the location of said track relative to said bearing.
Claim 17
Dependent Claim
150 words
In a tunnelling machine as claimed in claim 11 wherein said means for supporting said frame on a cylindrical wall comprises: a forward set and a rearward set of rollers rotatably mounted on said frame for mounting the frame while rollably supported by the walls of the tunnel, said rollers being mounted and oriented to produce an helical advance of said frame on rotation of said frame relative to the tunnel, Said rearward group of rollers being mounted on inwardly extending radial plungers, a static member rotatably mounted on said frame to allow relative rotation about the rotation axis, a member attached to said static member, designed to form a track for the inward end of said plungers and hence to determine the spacing of the axis of rotation of said static members from said tunnel walls means for adjusting the location of said track relative to said rotation axis.
Claim 18
Dependent Claim
135 words
In a tunnelling machine as claimed in claim 11 wherein said means for supporting said frame on a cylindrical wall comprises: rollers rotatably mounted on said frame for supporting the frame while rollably supported by the walls of the tunnel, means for supplying permanently deformable material in continuous strip form, means for guiding said strip for longitudinal movement between one of said rollers and the wall of the tunnel, for movement tangentially of and rollably relative to said roller, whereby said strip material is applied to the walls in an helical arrangement, the width of the strip material being related to the roller angular orientation to ensure that the successive strip turns overlap on the tunnel wall, at least some of the rollers being designed to corrugated the strip material applied to the tunnel wall.
Claim 19
Dependent Claim
128 words
In a tunnelling machine as claimed in claim 11 wherein said means for supporting said frame on a cylindrical wall comprises: a forward and a rearward ring of rollers, each roller being rotatably mounted on said frame, said forward and rearward rings being located to rollably support respectively, the forward and rearward ends of said frame on the cylindrical walls of said tunnel, the rollers in said rearward ring being mounted to be displaceable relative to said frame along radii from the axis of such cylindrical tunnel, and a guide member maintained stationary during rotation of said frame, designed to control said radial displacement of individual rollers relative to the frame as a function of the angular displacement of each said roller about the axis of said tunnel.
Claim 20
Dependent Claim
34 words
In a tunnelling machine as claimed in claim 15 wherein at least said one of said rollers is powered to rotate relative to said frame to impel said frame to rotate in said tunnel.
Claim 21
Dependent Claim
50 words
In a tunnelling machine, as claimed Inc. claim 11 wherein means are provided for controlling the operation of said arm and the operation of said implements, designed and constructed so that said arm is advanced between operations of said implements and said implements are operated between movements of said arm.
Claim 22
Dependent Claim
82 words
in a tunnelling machine as claimed in claim 11 wherein said frame is: provided with rollers rotatably mounted thereon, said rollers being designed to project outwardly beyond said frame and located and dimensioned to rollably support the frame on the walls of the tunnel, the rotational axes of said rollers being oriented so that, on rotation of said frame relative to said tunnel, the frame will advance in an helical manner; means for causing said frame to rotate relative to said tunnel.
Claim 23
Dependent Claim
18 words
A device as claimed in claim 18 wherein said arm is mounted on said frame for rotation therewith.
Claim 24
Dependent Claim
93 words
In a tunnelling machine, a frame provided with rollers rotatably mounted thereon, said rollers being designed and located to project outwardly beyond said frame and located and dimensioned to rollably support the frame on the walls of the tunnel, the rotational axes of said rollers being oriented so that on rotation of said frame relative to said tunnel, the frame will advance in an helical manner, means for mounting on one end of said frame, means for detaching material to be tunnelled; means for causing said frame to rotate relative to said tunnel.
Claim 25
Dependent Claim
93 words
In a tunnelling machine, a frame provided with rollers rotatably mounted thereon, said rollers being designed and located to project outwardly beyond said frame and located and dimensioned to rollably support the frame on the walls of the tunnel, the rotational axes of said rollers being oriented so that on rotation of said frame relative to said tunnel, the frame will advance in an helical manner, means for mounting on one end of said frame, means for detaching material to be tunnelled; means for causing said frame to rotate relative to said tunnel.
Claim 26
Dependent Claim
166 words
A device as claimed in claim 20 wherein said means for detaching material from one end of said tunnel is; an arm supported forwardly of said frame, for rotatably movEment relative to said tunnel in a predetermined sense thereby defining an advancing and a trailing direction; a plurality of digging implements mounted on said arm; each of said implements being selectively actuable to cyclically translate between an extended forward and a retracted rearward position relative to said arm in a direction, having in the initial part of the extension direction, a major component parallel to said axis of rotation; each of said implements being controlled to rotate, as well as translate toward the end of said translation extension, said rotation being directed to cause the tips of the implements to move the component in the trailing direction relative to aid arm rotation; each of said implements being provided with tips directed in the extension direction to facilitate entrance by said implement into the material being tunnelled.
Claim 27
Dependent Claim
74 words
A digging implement mounted on a support; means for causing said implement to start form a predetermined location and to move away from said support, initially with primarily a translatory motion, means for causing said implement after its initial movement to describe a rotation, to return to its location in said frame, said implement being shaped, at the end farthest from the frame, to assist its entry into subsurface material during said translatory motion.
Claim 28
Dependent Claim
74 words
A digging implement mounted on a support; means for causing said implement to start form a predetermined location and to move away from said support, initially with primarily a translatory motion, means for causing said implement after its initial movement to describe a rotation, to return to its location in said frame, said implement being shaped, at the end farthest from the frame, to assist its entry into subsurface material during said translatory motion.
Claim 29
Dependent Claim
26 words
Means as claimed in claim 22 wherein said implement end farthest from said support is shaped to provide a sharpened edge directed in the translatory direction.
Claim 30
Dependent Claim
172 words
In a tunnelling machine, having a frame for supporting the tunnelling means, where the tunnelling means is designed to produce a cylindrical tunnel, a forward set and a rearward set of rollers rotatably mounted on said frame for mounting the frame while rollably supported by the walls of the tunnel said rollers being mounted to produce an helical advance of said frame in the tunnel on rotation of said frame relative to the tunnel, said rollers being divided into a group associated with the forward end of the frame and a group associated with the rearward end of the frame, said rearward group being mounted on members radially movable relative to said fame over a predetermined range, control members for said radially movable members, a member maintained static relative to said frame, rotatably connected to said frame; means attached to said static member providing a track connected to control the radial translation of said control members relative to said frame, means for adjusting the location of said track relative to said bearing.
Claim 31
Dependent Claim
172 words
In a tunnelling machine, having a frame for supporting the tunnelling means, where the tunnelling means is designed to produce a cylindrical tunnel, a forward set and a rearward set of rollers rotatably mounted on said frame for mounting the frame while rollably supported by the walls of the tunnel said rollers being mounted to produce an helical advance of said frame in the tunnel on rotation of said frame relative to the tunnel, said rollers being divided into a group associated with the forward end of the frame and a group associated with the rearward end of the frame, said rearward group being mounted on members radially movable relative to said fame over a predetermined range, control members for said radially movable members, a member maintained static relative to said frame, rotatably connected to said frame; means attached to said static member providing a track connected to control the radial translation of said control members relative to said frame, means for adjusting the location of said track relative to said bearing.
Claim 32
Dependent Claim
152 words
In a tunnelling machine having a frame for supporting the tunnelling means, where the tunnelling means is designed to produce a cylindrical tunnel, a forward set and a rearward set of rollers rotatably mounted on said frame for mounting the frame while rollably supported by the walls of the tunnel, said rollers being mounted and oriented to produce an helical advance of said frame on rotation of said frame relative to the tunnel, said rearward group of rollers being mounted on inwardly extending radial plungers, a static member rotatably mounted on said frame to allow relative rotation about the rotation axis, a member attached to said static member, designed to form a track for the inward end of said plungers and hence to determine the spacing of the axis of rotation of said static members from said tunnel walls, means for adjusting the location of said track relative to said rotation axis.
Claim 33
Dependent Claim
152 words
In a tunnelling machine having a frame for supporting the tunnelling means, where the tunnelling means is designed to produce a cylindrical tunnel, a forward set and a rearward set of rollers rotatably mounted on said frame for mounting the frame while rollably supported by the walls of the tunnel, said rollers being mounted and oriented to produce an helical advance of said frame on rotation of said frame relative to the tunnel, said rearward group of rollers being mounted on inwardly extending radial plungers, a static member rotatably mounted on said frame to allow relative rotation about the rotation axis, a member attached to said static member, designed to form a track for the inward end of said plungers and hence to determine the spacing of the axis of rotation of said static members from said tunnel walls, means for adjusting the location of said track relative to said rotation axis.
Claim 34
Dependent Claim
171 words
In a tunnelling machine, having a frame for supporting tunnelling means, where the tunnelling means is designed to produce a cylindrical tunnel, rollers rotatably mounted on said frame for supporting the frame while rollably supported by the walls of the tunnel, means for supplying permanently deformable material in continuous strip form, means for guiding said strip for longitudinal movement between one of said rollers and the wall of the tunnel, for movement tangentially of and rollably relative to Said roller, whereby said strip material is applied to the walls in an helical arrangement, the width of the strip material being related to the roller angular orientation to ensure that the successive strip turns overlap on the tunnel wall, at least some of the rollers being designed to corrugate the strip material applied to the tunnel wall. 27 In a tunnelling machine as claimed in claim 26 wherein at least said one of said rollers is powered to rotate relative to said frame to impel said frame to rotate in said tunnel.
Claim 35
Dependent Claim
168 words
In a tunnelling machine having a frame having a forward and rearward end supporting at the forward end thereof, the tunnelling means, where such tunnelling means is designed to produce a cylindrical tunnel, a forward and a rearward ring of rollers, each roller being rotatably mounted on said frame, said forward and rearward rings being located to rollably support respectively the forward and rearward ends of said frame on the cylindrical walls of said tunnel, said roller axes being oriented to produce the helical advance of said frame in said tunnel on rotation of said frame in one direction about the tunnel axis, the rollers in said rearward ring being mounted to be displaceable relative to said frame along radii from the axis of such cylindrical tunnel, and a guide member maintained stationary during rotation of said frame, designed to control said radial displacement of individual rollers relative to the frame as a function of the angular displacement of each said roller about the axis of said tunnel.
Claim 36
Dependent Claim
168 words
In a tunnelling machine having a frame having a forward and rearward end supporting at the forward end thereof, the tunnelling means, where such tunnelling means is designed to produce a cylindrical tunnel, a forward and a rearward ring of rollers, each roller being rotatably mounted on said frame, said forward and rearward rings being located to rollably support respectively the forward and rearward ends of said frame on the cylindrical walls of said tunnel, said roller axes being oriented to produce the helical advance of said frame in said tunnel on rotation of said frame in one direction about the tunnel axis, the rollers in said rearward ring being mounted to be displaceable relative to said frame along radii from the axis of such cylindrical tunnel, and a guide member maintained stationary during rotation of said frame, designed to control said radial displacement of individual rollers relative to the frame as a function of the angular displacement of each said roller about the axis of said tunnel.
Claim 37
Dependent Claim
181 words
In a tunnelling machine, a frame an arm supported forward of said frame, for rotatable movement relative to said tunnel in a predetermined sense, said arm extending with a radial component relative to the axis of such rotatable movement, a digging implement mounted on said arm, such implement being selectively actuable to cyclically translate between an extended forward and a retracted rearward position relative to said arm, in a direction having in the initial part of the extension direction, a major component parallel to said axis of rotation, such implement being controlled to rotate as well as translate toward the end of said translation extension, said rotation being directed to cause the tip of the implement to move with a component on the trailing direction relative to said predetermined arm rotation sense, such implement being provided with a tip directed in the extension direction to facilitate entrance by said implement into the material being tunnelled, and means for causing said implement to perform its translation and rotation action at locations having different radial distances from the axis of said rotatable movement.
Claim 38
Dependent Claim
181 words
In a tunnelling machine, a frame an arm supported forward of said frame, for rotatable movement relative to said tunnel in a predetermined sense, said arm extending with a radial component relative to the axis of such rotatable movement, a digging implement mounted on said arm, such implement being selectively actuable to cyclically translate between an extended forward and a retracted rearward position relative to said arm, in a direction having in the initial part of the extension direction, a major component parallel to said axis of rotation, such implement being controlled to rotate as well as translate toward the end of said translation extension, said rotation being directed to cause the tip of the implement to move with a component on the trailing direction relative to said predetermined arm rotation sense, such implement being provided with a tip directed in the extension direction to facilitate entrance by said implement into the material being tunnelled, and means for causing said implement to perform its translation and rotation action at locations having different radial distances from the axis of said rotatable movement.
Claim 39
Dependent Claim
170 words
In a tunnelling machine, a frame, means for supporting said frame on a cylindrical tunnel wall, an arm supported on said frame and radially extending from and designed for rotary advancing movement in a predetermined sense about the axis of said tunnel wall, an implement mounted on said arm and mounted and designed to be movable thereon between a radially inward and a radially outward location thereof; means for actuating said implement for extension away from said arm and retraction toward said arm, means causing said implement, during said extension movement, to translate with a major component parallel to said rotation axis; means for causing said implement, after a predetermined translation, to rotate about an axis causing the implement to be displaced in a direction opposite to the direction of advance of said arm relative to the translation direction, means for retracting said element; means for intermittently advancing said arm, means for moving said implement to various radial locations along said arm between said radially inward and radially outward locations.
Claim 40
Dependent Claim
170 words
In a tunnelling machine, a frame, means for supporting said frame on a cylindrical tunnel wall, an arm supported on said frame and radially extending from and designed for rotary advancing movement in a predetermined sense about the axis of said tunnel wall, an implement mounted on said arm and mounted and designed to be movable thereon between a radially inward and a radially outward location thereof; means for actuating said implement for extension away from said arm and retraction toward said arm, means causing said implement, during said extension movement, to translate with a major component parallel to said rotation axis; means for causing said implement, after a predetermined translation, to rotate about an axis causing the implement to be displaced in a direction opposite to the direction of advance of said arm relative to the translation direction, means for retracting said element; means for intermittently advancing said arm, means for moving said implement to various radial locations along said arm between said radially inward and radially outward locations.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |