Patent US4180220A successfully refreshed from Google Patents.
US4180220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape cassette
Assignee: TDK Corp
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Filing: 1978-08-14
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Granted: 1979-12-25
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Expires: 1998-08-14
Abstract
Abstract A tape cassette comprises a cover for covering a wound tape which comprises a polar member mounted on a wall of the cover and a coil spring fitted to the polar member. The polar member has a narrow width slit at the free end and a wide width slit adjacent to the narrow width slit at the side of the fixed end and one end of the coil spring is inserted in to the wide width slit through the narrow width slit and the other end of the coil spring is contacted with a case body.
Inventors
- 👤 Haruo Shiba
- 👤 Takateru Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:43
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
In a tape cassette having a cover for covering a wound tape which comprises a polar member mounted on a wall of the cover and a spring fitted to the polar member, an improvement characterized in that the polar member has a narrow width slit at the free end and a wide width slit adjacent to the narrow width slit at the side of the fixed end and one end of the spring is inserted into the wide width slit and the other end of the spring is contacted with a case body.
Claim 2
Dependent Claim
93 words
In a tape cassette having a cover for covering a wound tape which comprises a polar member mounted on a wall of the cover and a spring fitted to the polar member, an improvement characterized in that the polar member has a narrow width slit at the free end and a wide width slit adjacent to the narrow width slit at the side of the fixed end and one end of the spring is inserted into the wide width slit and the other end of the spring is contacted with a case body.
Claim 3
Dependent Claim
37 words
A tape cassette according to claim 1 wherein the spring is a coil spring and one end of the coil spring is bent to the central direction and the other end is projected out of the coil.
Claim 4
Dependent Claim
34 words
A tape cassette according to claim 2 wherein the narrow width slit is opened to the edge of the polar member to guide the end of the coil spring bent to the central direction.
Claim 5
Dependent Claim
33 words
A tape cassette according to claim 2 wherein the wide width slit is formed adjacent to the narrow width slit to receive the end of the coil spring bent to the central direction.
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) | 1982-12-24 | 1983-06-25 | 1983-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-24 | 1987-06-25 | 1987-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-24 | 1991-06-25 | 1991-12-25 | $7700.00 | Window Closed / Lapsed |