US4222727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing granules from fine powder
Assignee: Phillips Petroleum Co
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Filing: 1978-12-15
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Granted: 1980-09-16
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Expires: 1998-12-15
Abstract
Abstract An apparatus for the preparation of granules from fine powder in which a shaft is mounted for rotation about the longitudinal axis of a cylindrical housing, a screw conveyor blade is mounted on the shaft to convey powder entering the housing through an inlet to a plurality of stirring pins which are arranged in a double helix along the shaft in a granulation zone of the housing, a disc being attached to the shaft to partially close the cross-section of the housing in a mid-portion of the granulation zone.
Inventors
- 👤 Ryoichi Adachi
- 👤 Toshihito Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:42
CPC Classifications
B; B29; B29B; B29B9/00; B01; B01J; B01J2/00; B01J2/10; C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/58; C01; C01P; C01P2004/00; C01P2004/51
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
169 words
An apparatus for the preparation of granules from fine powder comprising: a cylindrical housing including a cylindrical wall portion defining a longitudinal axis, a cylindrical granulation chamber symmetrically disposed about said axis, a longitudinally spaced entrance and exit disposed at opposite ends of said housing respectively and at least one inlet to said chamber for supply of a binder thereto; a shaft extending longitudinally through said granulation chamber coaxially with and mounted for rotation about said axis; a plurality of stirring pins fixedly attached to said shaft to project generally radially therefrom in spaced apart relationship along said axis substantially throughout the longitudinal extent of the granulation chamber; and obstruction means mounted on said shaft and extending generally normal to said axis to close a generally circular portion of a transverse cross-section of said granulation chamber and to define with the cylindrical wall portion an annular opening adjacent said cylindrical wall portion, whereby said annular opening inhibits longitudinal conveyance of smaller less well formed granules therepast toward said exit.
Claim 2
Independent Claim
169 words
An apparatus for the preparation of granules from fine powder comprising: a cylindrical housing including a cylindrical wall portion defining a longitudinal axis, a cylindrical granulation chamber symmetrically disposed about said axis, a longitudinally spaced entrance and exit disposed at opposite ends of said housing respectively and at least one inlet to said chamber for supply of a binder thereto; a shaft extending longitudinally through said granulation chamber coaxially with and mounted for rotation about said axis; a plurality of stirring pins fixedly attached to said shaft to project generally radially therefrom in spaced apart relationship along said axis substantially throughout the longitudinal extent of the granulation chamber; and obstruction means mounted on said shaft and extending generally normal to said axis to close a generally circular portion of a transverse cross-section of said granulation chamber and to define with the cylindrical wall portion an annular opening adjacent said cylindrical wall portion, whereby said annular opening inhibits longitudinal conveyance of smaller less well formed granules therepast toward said exit.
Claim 3
Dependent Claim
26 words
Apparatus according to claim 1, wherein said obstruction means is a disc defining with said cylindrical wall portion an annular opening adjacent said cylindrical wall portion.
Claim 4
Dependent Claim
20 words
Apparatus according to claim 2, wherein said disc is disposed approximately centrally of the longitudinal extent of said granulation chamber.
Claim 5
Dependent Claim
17 words
Apparatus according to claim 3, wherein said disc is fixedly mounted to said shaft for rotation therewith.
Claim 6
Dependent Claim
22 words
Apparatus according to claim 4, wherein said plurality of stirring pins are symmetrically disposed in at least one helix about said shaft.
Claim 7
Dependent Claim
17 words
Apparatus according to claim 5, wherein said plurality of stirring pins are arranged in a double helix.
Claim 8
Dependent Claim
33 words
Apparatus according to claim 6, wherein a screw conveyor blade is fixedly attached to said shaft adjacent said entrance to convey powder from said entrance to said stirring pins in said granulation chamber.
Claim 9
Dependent Claim
24 words
Apparatus according to claim 7, wherein said stirring pins project a greater radial distance from said axis than does the pheriphery of said disc.
Claim 10
Dependent Claim
50 words
Apparatus according to claim 8, wherein the radial clearance between the ends of the stirring pins and said cylindrical wall portion is from about 5 millimeters to about 15 millimeters and the radial clearance between said disc and said cylindrical wall portion is from about 18 millimeters to 80 millimeters.
Claim 11
Dependent Claim
27 words
Apparatus according to claim 9, wherein the radial clearance between said disc and a said cylindrical wall portion is from about 20 millimeters to about 25 millimeters.
References Cited (Backward Citations)
US2550802A
Cited
US3674437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |