Patent US4527755A successfully refreshed from Google Patents.
US4527755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hinged visor-type door for tape cassette
Assignee: 3M Co
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Filing: 1983-10-17
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Granted: 1985-07-09
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Expires: 2003-10-17
Abstract
Abstract A videotape cassette has a visor-type door, at each end of which is an ear or corner part at which a pin hinges the door to a housing. As in the prior art, the door is biased to either a fully opened or fully closed position. In the novel cassette, the biasing results from a free-standing finger formed in a wall of the housing, which finger acts as a spring against a squarish platform on the inner face of an ear of the door.
Inventors
- 👤 Robert M. Rood
- 👤 James J. Wulfing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:56
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08735
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
105 words
Tape cassette comprising a housing, an elongated visor-type door, at each end of which is an ear extending orthogonally to the inner face of the door, at least one ear having first and second edges which intersect at substantially right angles, a pin hinging each ear to the housing, and a spring mechanism which rests against said first edge when the door is closed and against said second edge while the door is open and is under flexure when resting against the intersection of those edges while the door is partially open, wherein the improvement comprises a resilient free-standing finger which is said spring mechanism.
Claim 2
Dependent Claim
105 words
Tape cassette comprising a housing, an elongated visor-type door, at each end of which is an ear extending orthogonally to the inner face of the door, at least one ear having first and second edges which intersect at substantially right angles, a pin hinging each ear to the housing, and a spring mechanism which rests against said first edge when the door is closed and against said second edge while the door is open and is under flexure when resting against the intersection of those edges while the door is partially open, wherein the improvement comprises a resilient free-standing finger which is said spring mechanism.
Claim 3
Dependent Claim
37 words
Tape cassette as defined in claim 1 wherein said first and second edges respectively extend substantially perpendicular and parallel to the inner face of the door, and the first edge faces inwardly when the door is closed.
Claim 4
Dependent Claim
31 words
Tape cassette as defined in claim 2 and having a squarish platform on the inner face of said one ear, and said first and second edges are edges of the platform.
Claim 5
Dependent Claim
30 words
Tape cassette as defined in claim 3 having a platform as defined on the inner face of each ear and having a free-standing finger acting against edges of each platform.
Claim 6
Dependent Claim
19 words
Tape cassette as defined in claim 3 wherein said edges and the contacting face of the finger are flat.
Claim 7
Dependent Claim
39 words
Tape cassette as defined in claim 3 wherein each of said edges is concave and the contacting face of the finger is convex and mates with the concave edges when the door is either fully opened or fully closed.
Claim 8
Dependent Claim
26 words
Tape cassette as defined in claim 1 wherein each pin projects from the inner face of an ear and fits into an opening in the housing.
Claim 9
Dependent Claim
22 words
Tape cassette as defined in claim 1 wherein each pin projects from the housing and fits into an opening in an ear.
Claim 10
Dependent Claim
21 words
Tape cassette as defined in claim 1 wherein each of the door and the housing including its spring is molded plastic.
References Cited (Backward Citations)
US3809219A
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US4363456A
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US4386746A
Cited
GB2091213A
Cited
US4449677A
Cited
US4418373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |