Patent US3898009A successfully refreshed from Google Patents.
US3898009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cartridge pencil
Assignee: Western International Industries Ltd
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Filing: 1971-02-16
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Granted: 1975-08-05
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Expires: 1991-02-16
Abstract
Abstract A cartridge-type pencil is described having a plurality of individual writing cartridges positioned axially within a tubular member and adapted to move axially forward within the bore of the tubular member. The individual cartridge-like writing elements each have a rearwardly positioned skirt element adapted to engage an interior discontinuity positioned adjacent the tip of the tubular member to restrain the forwardmost cartridge from movement back into the barrel.
Inventors
- 👤 Orland M Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:30
CPC Classifications
B; B43; B43K; B43K21/00; B43K21/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
222 words
A writing implement comprising: a tubular member having a front end and a rear end and having an interior discontinuity positioned adjacent the front end thereof; and a plurality of writing cartridges slidably positioned axially within said tubular member, each cartridge having a protruding writing point at the forward end thereof and a discontinuityengaging resiliently flexible shirt positioned to engage said interior discontinuity and to frictionally engage the interior of the tubular member whenever said cartridge is in the forward end of said tubular member with the writing point thereof positioned for use, said skirt preventing rearward movement of said cartridge back into said barrel under writing pressure but permitting forward motion of said cartridges so that the frontmost cartridge may be removed and inserted into said rear end of said tubular member causing said plurality of writing cartridges to slide axially forward toward said front end exposing the writing tip of the next of said plurality of writing cartridges for use with said skirt thereof engaging said discontinuity preventing rearward movement of said next cartridge, said discontinuity comprising an annular slot positioned in the interior wall of said tubular member, said slot having one face thereof positioned on a plane substantially perpendicular to the axis of said tubular member acting as the forcebearing surface receiving axial thrust forces from said skirt.
Claim 2
Dependent Claim
222 words
A writing implement comprising: a tubular member having a front end and a rear end and having an interior discontinuity positioned adjacent the front end thereof; and a plurality of writing cartridges slidably positioned axially within said tubular member, each cartridge having a protruding writing point at the forward end thereof and a discontinuityengaging resiliently flexible shirt positioned to engage said interior discontinuity and to frictionally engage the interior of the tubular member whenever said cartridge is in the forward end of said tubular member with the writing point thereof positioned for use, said skirt preventing rearward movement of said cartridge back into said barrel under writing pressure but permitting forward motion of said cartridges so that the frontmost cartridge may be removed and inserted into said rear end of said tubular member causing said plurality of writing cartridges to slide axially forward toward said front end exposing the writing tip of the next of said plurality of writing cartridges for use with said skirt thereof engaging said discontinuity preventing rearward movement of said next cartridge, said discontinuity comprising an annular slot positioned in the interior wall of said tubular member, said slot having one face thereof positioned on a plane substantially perpendicular to the axis of said tubular member acting as the forcebearing surface receiving axial thrust forces from said skirt.
Claim 3
Dependent Claim
202 words
A writing element comprising: a tubular member having a front end and a rear end and having an interior discontinuity positioned adjacent the front end thereof; and a plurality of writing cartridges slidably positioned axially within said tubular member, each cartridge having a protruding writing point at the forward end thereof and a discontinuity-engaging resiliently flexible skirt positioned to engage said interior discontinuity and to frictionally engage the interior of the tubular member whenever said cartridge is in the forward end of said tubular member with the writing point thereof positioned for use, said skirt preventing rearward movement of said cartridge back into said barrel under writing pressure but permitting forward motion of said cartridges so that the frontmost cartridge may be removed and inserted into said rear end of said tubular member causing said plurality of writing cartridges to slide axially forward toward said front end exposing the writing tip of the next of said plurality of writing cartridges for use with said skirt thereof engaging said discontinuity preventing rearward movement of said cartridge, said discontinuity comprising an annular inside rib having an inside diameter greater than the diameter of said cartridges but less than the diameter of said flexible skirt.
Claim 4
Dependent Claim
202 words
A writing element comprising: a tubular member having a front end and a rear end and having an interior discontinuity positioned adjacent the front end thereof; and a plurality of writing cartridges slidably positioned axially within said tubular member, each cartridge having a protruding writing point at the forward end thereof and a discontinuity-engaging resiliently flexible skirt positioned to engage said interior discontinuity and to frictionally engage the interior of the tubular member whenever said cartridge is in the forward end of said tubular member with the writing point thereof positioned for use, said skirt preventing rearward movement of said cartridge back into said barrel under writing pressure but permitting forward motion of said cartridges so that the frontmost cartridge may be removed and inserted into said rear end of said tubular member causing said plurality of writing cartridges to slide axially forward toward said front end exposing the writing tip of the next of said plurality of writing cartridges for use with said skirt thereof engaging said discontinuity preventing rearward movement of said cartridge, said discontinuity comprising an annular inside rib having an inside diameter greater than the diameter of said cartridges but less than the diameter of said flexible skirt.
Claim 5
Dependent Claim
219 words
A writing implement comprising: a tubular member having a front end and a rear end and having an interior discontinuity positioned adjacent the front end thereof; and a plurality of writing cartridges slidably positioned axially within said tubular member, each cartridge having a protruding writing point at the forward end thereof and a discontinuity-engaging resiliently flexible skirt positioned to engage said interior discontinuity and to frictiOnally engage the interior of the tubular member whenever said cartridge is in the forward end of said tubular member with the writing point thereof positioned for use, said skirt preventing rearward movement of said cartridge back into said barrel under writing pressure but permitting forward motion of said cartridges so that the frontmost cartridge may be removed and inserted into said rear end of said tubular member causing said plurality of writing cartridges to slide axially forward toward said front end exposing the writing tip of the next of said plurality of writing cartridges for use with said skirt thereof engaging said discontinuity preventing rearward movement of said next cartridge, said tubular member comprising a substantially tubular barrel and a removable front sleeve element, said discontinuity being formed at the junction between said barrel and said sleeve element, the barrel having a reduced diameter section at the forward end thereof forming said discontinuity.
Claim 6
Dependent Claim
219 words
A writing implement comprising: a tubular member having a front end and a rear end and having an interior discontinuity positioned adjacent the front end thereof; and a plurality of writing cartridges slidably positioned axially within said tubular member, each cartridge having a protruding writing point at the forward end thereof and a discontinuity-engaging resiliently flexible skirt positioned to engage said interior discontinuity and to frictiOnally engage the interior of the tubular member whenever said cartridge is in the forward end of said tubular member with the writing point thereof positioned for use, said skirt preventing rearward movement of said cartridge back into said barrel under writing pressure but permitting forward motion of said cartridges so that the frontmost cartridge may be removed and inserted into said rear end of said tubular member causing said plurality of writing cartridges to slide axially forward toward said front end exposing the writing tip of the next of said plurality of writing cartridges for use with said skirt thereof engaging said discontinuity preventing rearward movement of said next cartridge, said tubular member comprising a substantially tubular barrel and a removable front sleeve element, said discontinuity being formed at the junction between said barrel and said sleeve element, the barrel having a reduced diameter section at the forward end thereof forming said discontinuity.
Claim 7
Dependent Claim
217 words
A writing instrument comprising: a tubular member having a front end and a rear end and having an interior discontinuity positioned adjacent the front end thereof; and a plurality of writing cartridges slidably positioned axially within said tubular member, each cartridge having a protruding writing point at the forward end thereof and a discontinuity-engaging resiliently flexible skirt positioned to engage said interior discontinuity and to frictionally engage the interior of the tubular member whenever said cartridge is in the forward end of said tubular member with the writing point thereof positioned for use, said skirt preventing rearward movement of said cartridge back into said barrel under writing pressure but permitting forward motion of said cartridges so that the frontmost cartridge may be removed and inserted into said rear end of said tubular member causing said plurality of writing cartridges to slide axially forward toward said front end exposing the writing tip of the next of said plurality of writing cartridges for use with said skirt thereof engaging said discontinuity preventing rearward movement of said next cartridge, said tubular member comprising a substantially tubular barrel and a removable front sleeve element, said discontinuity being formed at the junction between said barrel and said sleeve element, said sleeve element having a chamfered interior rear sleeve surface forming said discontinuity.
Claim 8
Dependent Claim
217 words
A writing instrument comprising: a tubular member having a front end and a rear end and having an interior discontinuity positioned adjacent the front end thereof; and a plurality of writing cartridges slidably positioned axially within said tubular member, each cartridge having a protruding writing point at the forward end thereof and a discontinuity-engaging resiliently flexible skirt positioned to engage said interior discontinuity and to frictionally engage the interior of the tubular member whenever said cartridge is in the forward end of said tubular member with the writing point thereof positioned for use, said skirt preventing rearward movement of said cartridge back into said barrel under writing pressure but permitting forward motion of said cartridges so that the frontmost cartridge may be removed and inserted into said rear end of said tubular member causing said plurality of writing cartridges to slide axially forward toward said front end exposing the writing tip of the next of said plurality of writing cartridges for use with said skirt thereof engaging said discontinuity preventing rearward movement of said next cartridge, said tubular member comprising a substantially tubular barrel and a removable front sleeve element, said discontinuity being formed at the junction between said barrel and said sleeve element, said sleeve element having a chamfered interior rear sleeve surface forming said discontinuity.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |