US4564878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cassette removable piece
Assignee: 3M Co
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Filing: 1984-02-07
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Granted: 1986-01-14
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Expires: 2004-02-07
Abstract
Abstract One broad wall of a recording cassette has a recognition hole which is covered by a breakout tab (here called a "removable piece"), and there is a chamber projecting from the other broad wall of the cassette such that a punch which dislodges the removable piece permanently wedges it into the chamber.
Inventors
- 👤 Mark W. Weavers
- 👤 Charles D. Gebeke
- 👤 Ken'ichi Yamasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:51
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08714
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
A recording cassette comprising a pair of shells, each having a broad wall, and a length of recording medium within the shells, said shells including a removable piece adapted to be broken from one broad wall to form a hole that can be recognized by a hole-sensing mechanism of a deck adapted to receive the cassette and a chamber projecting from the other broad wall, said chamber having an inner surface defining an opening adjacent to and larger than said removable piece for receiving the removable piece, and a tapered interior having a portion smaller than the piece that will frictionally engage and permanently retain the removable piece when the removable piece is forced into the chamber.
Claim 2
Dependent Claim
117 words
A recording cassette comprising a pair of shells, each having a broad wall, and a length of recording medium within the shells, said shells including a removable piece adapted to be broken from one broad wall to form a hole that can be recognized by a hole-sensing mechanism of a deck adapted to receive the cassette and a chamber projecting from the other broad wall, said chamber having an inner surface defining an opening adjacent to and larger than said removable piece for receiving the removable piece, and a tapered interior having a portion smaller than the piece that will frictionally engage and permanently retain the removable piece when the removable piece is forced into the chamber.
Claim 3
Dependent Claim
16 words
A recording cassette as defined in claim 1 wherein the removable piece is disk-like in shape.
Claim 4
Dependent Claim
31 words
A recording cassette as defined in claim 2 wherein the removable piece is formed with a flange projecting into the chamber before the removable piece is broken from the broad wall.
Claim 5
Dependent Claim
19 words
A recording cassette as defined in claim 3 wherein the inner surface of the chamber is frusto-conical in shape.
Claim 6
Dependent Claim
27 words
A recording cassette as defined in claim 4 wherein said removable piece and said flange have a frusto-conical exterior surface matching the inner surface of the chamber.
Claim 7
Dependent Claim
20 words
A recording cassette as defined in claim 1 wherein the inner surface of the chamber has a polygonal cross-sectional shape.
Claim 8
Dependent Claim
20 words
A recording cassette as defined in claim 6 wherein the inner surface of the chamber has a hexagonal cross-sectional shape.
Claim 9
Dependent Claim
30 words
A recording cassette as defined in claim 1 wherein the inner surface of the chamber is defined by at least one radially inwardly projecting rib extending axially of the chamber.
Claim 10
Dependent Claim
26 words
A recording cassette as defined in claim 8 wherein the inner surface of the chamber is defined by a plurality of radially extending inwardly projecting ribs.
References Cited (Backward Citations)
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Cited
US3686470A
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US3839736A
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US4012011A
Cited
US4320421A
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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) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |