Patent US4607808A successfully refreshed from Google Patents.
US4607808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wear-resistant capstan for belt driven cartridge
Assignee: 3M Co
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Filing: 1985-01-16
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Granted: 1986-08-26
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Expires: 2005-01-16
Abstract
Abstract A conductive, carbon-filled acetal resin capstan within a belt driven tape cartridge is rotatably supported by a pin and includes a cylindrical outer surface for engaging a drive belt. The capstan is electrically conductive to dissipate static electrical charges and includes a polytetrafluoroethylene-filled acetal resin sleeve interposed between the pin and the capstan to increase the wear resistance of the capstan where it frictionally engages the cartridge.
Inventors
- 👤 Leslie M. Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:18
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08778; G11B15/00; G11B15/18; G11B15/26; G11B15/28; Y; Y10; Y10S; Y10S242/00; Y10S242/90; Y10S242/906
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
64 words
A capstan assembly rotatably supported by a mounting pin between spaced, parallel walls of a tape cartridge and having a cylindrical outer surface engaging a drive belt, comprising: a conductive, carbon-filled acetal resin capstan providing said cylindrical outer surface; and a wear-resistant, acetal resin sleeve interposed between said pin and said capstan, which sleeve engages said capstan and is rotatably supported by said pin.
Claim 2
Dependent Claim
64 words
A capstan assembly rotatably supported by a mounting pin between spaced, parallel walls of a tape cartridge and having a cylindrical outer surface engaging a drive belt, comprising: a conductive, carbon-filled acetal resin capstan providing said cylindrical outer surface; and a wear-resistant, acetal resin sleeve interposed between said pin and said capstan, which sleeve engages said capstan and is rotatably supported by said pin.
Claim 3
Dependent Claim
46 words
A capstan assembly according to claim 1 wherein said capstan includes a recess adjacent said sleeve and said sleeve includes a corresponding radial projection engaging said recess to lock said sleeve and said capstan together and thereby prevent relative movement between said capstan and said sleeve.
Claim 4
Dependent Claim
17 words
A capstan assembly according to claim 1 wherein said acetal resin sleeve further includes a polytetrafluoroethylene filler.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |