Patent US4612593A successfully refreshed from Google Patents.
US4612593A
Expired / Lapsed
US
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Tape pad for use in magnetic recording tape cassette
Assignee: Fujifilm Holdings Corp
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Filing: 1982-12-10
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Granted: 1986-09-16
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Expires: 2002-12-10
Abstract
Abstract A tape pad for use in a magnetic recording tape cassette for pressing the recording tape against the magnetic head of a tape recorder comprises a felt piece having the following characteristics: fulling density: 0.35 to 0.4 g/cm3 average diameter of fibers: 0.016 to 0.035 mm average length of fibers: 1.4 to 5.0 mm surface roughness: 0.05 to 0.15 mm +P]
Inventors
- 👤 Kengo Oishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:04
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08757; G11B23/08771; G11B15/00; G11B15/60; G11B15/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A tape pad for use in a magnetic recording tape cassettes for pressing a magnetic recording tape against a magnetic head of a tape recorder, the tape pad comprising a felt pad characterized in that at least the part of the felt pad brought into contact with the magnetic recording tape has an average density of 0.35 to 0.4 g/cm 3 , an average diameter of fibers of 0.016 to 0.035 mm, an average length of fibers of 1.4 to 5.0 mm, and a surface roughness of 0.05 to 0.15 mm thereby improving the electromagnetic conversion characteristics of the magnetic recording tape.
Claim 2
Dependent Claim
102 words
A tape pad for use in a magnetic recording tape cassettes for pressing a magnetic recording tape against a magnetic head of a tape recorder, the tape pad comprising a felt pad characterized in that at least the part of the felt pad brought into contact with the magnetic recording tape has an average density of 0.35 to 0.4 g/cm 3 , an average diameter of fibers of 0.016 to 0.035 mm, an average length of fibers of 1.4 to 5.0 mm, and a surface roughness of 0.05 to 0.15 mm thereby improving the electromagnetic conversion characteristics of the magnetic recording tape.
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) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |