Patent US3389915A successfully refreshed from Google Patents.
US3389915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio device
Assignee: CBS Broadcasting Inc
•
Filing: 1965-10-18
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Granted: 1968-06-25
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Expires: 1985-10-18
Abstract
No abstract record available.
Inventors
- 👤 Charles L Owen
- 👤 Frank J Silhavy
- 👤 Henryk W Meresz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:16
CPC Classifications
G; G11; G11B; G11B33/00; G11B33/02; G11B33/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2238412A
Cited
US2292856A
Cited
US2212623A
Cited
US2622700A
Cited
US3162980A
Cited
US3245688A
Cited
US3165320A
Cited
US3285609A
Cited
US3285612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |