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US4466564A
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Belt for belt-driven recording tape pack
Assignee: 3M Co
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Filing: 1981-09-14
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Granted: 1984-08-21
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Expires: 2001-09-14
Abstract
Abstract In a tape which is driven by an elastic pretensioned belt, discontinuities such as embossings in the surface of the belt promote the release of air from between the belt and the underlying tape, thus minimizing variations in tape tension and tape speed.
Inventors
- 👤 David P. Smith
- 👤 Robert A. von Behren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:36
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/26; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08778
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A thin, continuous, elastic, flexible, pretensioned belt for a belt-driven recording tape pack, wherein pressure is exerted by the belt on the tape pack over an extended area, and arises solely from the tension in the belt, wherein in the improvement, the belt is characterized by a microscopically rough surface having discontinuities ranging in size between 0.2 and 40 micrometers peak to peak, such discontinuities not being discernable by the naked eye and which extend over substantially the full length of the face which contacts the tape pack to promote the release of air from between the belt and the underlying tape.
Claim 2
Dependent Claim
102 words
A thin, continuous, elastic, flexible, pretensioned belt for a belt-driven recording tape pack, wherein pressure is exerted by the belt on the tape pack over an extended area, and arises solely from the tension in the belt, wherein in the improvement, the belt is characterized by a microscopically rough surface having discontinuities ranging in size between 0.2 and 40 micrometers peak to peak, such discontinuities not being discernable by the naked eye and which extend over substantially the full length of the face which contacts the tape pack to promote the release of air from between the belt and the underlying tape.
Claim 3
Dependent Claim
30 words
A belt as defined in claim 1 wherein in the improvement said belt is characterized by surface discontinuities extending over substantially the full length of both faces of the belt.
Claim 4
Dependent Claim
29 words
A belt as defined in claim 1 wherein in the improvement said belt is characterized by a layer containing fine particulate matter to thereby provide said microscopically rough surface.
Claim 5
Dependent Claim
26 words
A belt as defined in claim 1 wherein in the improvement said belt is characterized by an abraded surface to thereby provide said microscopically rough surface.
Claim 6
Dependent Claim
26 words
A belt as defined in claim 1 wherein in the improvement said belt is characterized by an embossed surface to thereby provide said microscopically rough surface.
Claim 7
Dependent Claim
22 words
A belt as defined in claim 6 wherein in the improvement said embossed surface is further characterized by a random embossed pattern.
Claim 8
Dependent Claim
37 words
A belt as defined in claim 1 wherein in the improvement said belt is characterized by surface discontinuities comprising a plurality of narrow ridges extending substantially parallel to each other over substantially the length of the belt.
References Cited (Backward Citations)
US383373A
Cited
US627810A
Cited
US1028783A
Cited
US2017291A
Cited
US2295432A
Cited
US2405496A
Cited
US3106319A
Cited
US3141593A
Cited
US3643892A
Cited
US3907230A
Cited
US3965764A
Cited
US4342809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |