Patent US4378899A successfully refreshed from Google Patents.
US4378899A
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Tape drive capstan
Assignee: Northrop Grumman Innovation Systems LLC
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Filing: 1981-09-02
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Granted: 1983-04-05
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Expires: 2001-09-02
Abstract
Abstract A tape drive capstan has a porous ceramic matrix in the form of a cylindrical shell using spherical ceramic particles bonded together to form a network of interstitial pores which are substantially uniform in size and interconnected. A urethane elastomer is impregnated into the pores to form a tape driving surface on the outside surface of the cylinder. The outer surface of the capstan is finish-ground to an outside diameter suitable for use in a tape drive apparatus. The particles occupy approximately 70% of the internal volume of the shell and the elastomer occupies the remaining 30%. The shell is attached by an epoxy to an outside surface of a drive shaft suitable for driving the capstan.
Inventors
- 👤 Herbert F. Sanford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:24
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/26; G11B15/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
35 words
A capstan comprising a matrix of ceramic particles forming a network of interstitial interconnected pores and an elastomer material substantially filling said pores to provide a surface on said matrix having a tape driving capability.
Claim 2
Dependent Claim
35 words
A capstan comprising a matrix of ceramic particles forming a network of interstitial interconnected pores and an elastomer material substantially filling said pores to provide a surface on said matrix having a tape driving capability.
Claim 3
Dependent Claim
15 words
A capstan as set forth in claim 1 wherein said elastomer is a urethane elastomer.
Claim 4
Dependent Claim
33 words
A capstan as set forth in claim 1 wherein said matrix is a hollow cylindrical shell and further including a drive shaft and an adhesive for bonding said shell to said drive shaft.
Claim 5
Dependent Claim
14 words
A capstan as set forth in claim 1 wherein said particles are substantially spherical.
Claim 6
Dependent Claim
16 words
A capstan as set forth in claim 4 wherein said matrix is a hollow cylindrical shell.
Claim 7
Dependent Claim
32 words
A capstan as set forth in claim 1 wherein said particles are approximately 70 percent of the volume of said matrix and said elastomer substantially fills the remaining volume of said matrix.
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) | 1986-04-04 | 1986-10-04 | 1987-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-04 | 1990-10-04 | 1991-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-04 | 1994-10-04 | 1995-04-05 | $7700.00 | Window Closed / Lapsed |