US4656549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvements in plate springs for tape cassettes in particular video tape cassettes
Assignee: BASF SE
•
Filing: 1984-12-13
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Granted: 1987-04-07
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Expires: 2004-12-13
Abstract
Abstract A tape cassette is provided with a pressure plate spring which has a tape-length indication comprising indicator elements which have been cut in or cut out mechanically. Advantageously, both long arms possess such indicators, which may even be of different types. In a particularly advantageous spring shape, one long spring arm has an edge possessing incisions and the other long spring arm has an edge possessing projections, as a result of which the springs can be arranged for punching in such a way that waste is avoided.
Inventors
- 👤 Klaus Schoettle
- 👤 Heinz Berger
- 👤 Herbert Dietze
- 👤 Joachim Seitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:48
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08721
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
88 words
A tape cassette, in particular a video tape cassette, housing a pair of rotatable reels and having a top with at least one window therein, and a plate spring for holding down the reels, said plate spring essentially consisting of two long spring arms and fastening means located centrally with respect to said arms, and having tape-length indicators on at least one of the long spring arms, wherein the tape-length indicators are in the form of extensions or incisions adjacent outer edges of the two long spring arms.
Claim 2
Dependent Claim
88 words
A tape cassette, in particular a video tape cassette, housing a pair of rotatable reels and having a top with at least one window therein, and a plate spring for holding down the reels, said plate spring essentially consisting of two long spring arms and fastening means located centrally with respect to said arms, and having tape-length indicators on at least one of the long spring arms, wherein the tape-length indicators are in the form of extensions or incisions adjacent outer edges of the two long spring arms.
Claim 3
Dependent Claim
34 words
A tape cassette as claimed in claim 1, wherein one long arm of the plate spring possesses incisions, and the other long arm of the said spring possesses extensions which fit into the incisions.
Claim 4
Dependent Claim
92 words
A plate spring for a tape cassette, in particular a video tape cassette, housing a pair of rotatable reels and having a top with at least one window therein, and a plate spring for holding down the reels, said plate spring essentially consisting of two long spring arms and fastening means located centrally with respect to said arms, and having tape-length indicators on at least one of the long spring arms, wherein the tape-length indicators are in the form of extensions or incisions at outer edges of the two long spring arms.
Claim 5
Dependent Claim
92 words
A plate spring for a tape cassette, in particular a video tape cassette, housing a pair of rotatable reels and having a top with at least one window therein, and a plate spring for holding down the reels, said plate spring essentially consisting of two long spring arms and fastening means located centrally with respect to said arms, and having tape-length indicators on at least one of the long spring arms, wherein the tape-length indicators are in the form of extensions or incisions at outer edges of the two long spring arms.
Claim 6
Dependent Claim
28 words
A plate spring as claimed in claim 3, wherein one long spring arm possesses incisions, and the other long spring arm has extensions which fit into the incisions.
References Cited (Backward Citations)
US4128216A
Cited
DE8330710U1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |