Patent US3413832A successfully refreshed from Google Patents.
US3494525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multitrack tape recorder with automatic track switching
Assignee: Borg Warner Corp
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Filing: 1968-04-18
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Granted: 1970-02-10
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Expires: 1988-04-18
Abstract
No abstract record available.
Inventors
- 👤 Selmer L Wiig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:06
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/602; G11B15/18; G11B15/26; G11B15/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2669454A
Cited
US2888261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |