Patent US4358071A successfully refreshed from Google Patents.
US4358071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cassette case
Assignee: TDK Corp
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Filing: 1980-05-20
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Granted: 1982-11-09
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Expires: 2000-05-20
Abstract
Abstract A tape cassette formed from a cassette body having sections thereof which are adapted to be contacted by a tape and which have a surface roughness within the range of about 3 to 15 microns. In the production of such a cassette, those sections of the case which are adapted to be contacted by the tape are honed to provide a surface roughness within the specified micron range.
Inventors
- 👤 Masatoshi Okamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:56
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; Y; Y10; Y10S; Y10S242/00; Y10S242/90
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
87 words
In a tape cassette that includes a cassette body having sections thereof which are adapted to be contacted by a tape, the improvement wherein said sections have a surface roughness within the range of about 3 to 15 microns, and wherein said body comprises a metal frame formed by die casting, a first plastic plate provided on one side of said frame, and a second plastic plate on the other side of said frame, said tape contact sections of said body constituting parts of said metal frame.
Claim 2
Dependent Claim
87 words
In a tape cassette that includes a cassette body having sections thereof which are adapted to be contacted by a tape, the improvement wherein said sections have a surface roughness within the range of about 3 to 15 microns, and wherein said body comprises a metal frame formed by die casting, a first plastic plate provided on one side of said frame, and a second plastic plate on the other side of said frame, said tape contact sections of said body constituting parts of said metal frame.
Claim 3
Dependent Claim
19 words
A tape cassette as in claim 1, wherein said surface roughness is within the range of about 3-10 microns.
References Cited (Backward Citations)
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US2134997A
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US2973159A
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US3099414A
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US3495787A
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US4101096A
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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) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |