US3950786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape cassette with sliding door to inhibit recording
Assignee: SYNCOM TECHNOLOGIES Inc A CORP OF MN
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Filing: 1975-02-07
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Granted: 1976-04-13
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Expires: 1995-02-07
Abstract
Abstract A magnetic tape cassette is described in which there is provided a cavity in a rear wall of the cassette body for receiving a cavity sensing mechanism mounted internally in a cassette recording apparatus. The mechanism serves to enable and inhibit recording circuits in the apparatus as a function of its access to the cavity. A sliding door having at least two positions is provided to selectively open and close the cavity to the sensing mechanism to thereby provide control over the recording functions of the apparatus.
Inventors
- 👤 Bruce D. Shapley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:02
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/05; G11B15/06; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08714
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
88 words
In a magnetic tape cassette, said cassette having a rear wall in which is provided a first cavity for receiving a recording control element mounted internally in a magnetic tape recording apparatus, the improvement comprising: means forming a second cavity in said rear wall, said second cavity being entirely enclosed except for an opening at an edge of said first cavity; and a movable member slidably mounted in said second cavity and movable between a first and a second position through said opening for covering said first cavity.
Claim 2
Dependent Claim
88 words
In a magnetic tape cassette, said cassette having a rear wall in which is provided a first cavity for receiving a recording control element mounted internally in a magnetic tape recording apparatus, the improvement comprising: means forming a second cavity in said rear wall, said second cavity being entirely enclosed except for an opening at an edge of said first cavity; and a movable member slidably mounted in said second cavity and movable between a first and a second position through said opening for covering said first cavity.
Claim 3
Dependent Claim
47 words
The improvement according to claim 1 wherein said movable member comprises a raised member forming a fingernail-gripping means which extends outwardly from one end of said movable member, and further comprising means for releasably retaining said movable member in either of said first and said second positions.
Claim 4
Dependent Claim
76 words
The improvement according to claim 2 wherein said retaining means comprises an engaging means on said movable member and a first and a second recess in spaced positions in a wall of said second cavity, corresponding to said first and said second positions, for releasably receiving said engaging means so that, when said engaging means is engaged in either of said recesses, said movable member is restrained from sliding until a predetermined force is applied thereto.
Claim 5
Dependent Claim
30 words
A cassette according to claim 1 wherein said movable member and said second cavity include a means for releasably retaining said movable member in said first and said second position.
Claim 6
Dependent Claim
32 words
A cassette according to claim 4 wherein said retaining means comprises a first and a second means which releasably engage when said movable member is in said first and said second position.
Claim 7
Dependent Claim
54 words
A cassette according to claim 5 wherein said first means comprises a raised portion on said movable member; and said second means comprises a first and a second indentation in the wall of said second cavity for releasably receiving said raised portion when said movable member is in said first and said second positions.
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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |