US2689738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromechanical phonograph transducer
Assignee: Webster Electric Co Inc
•
Filing: 1949-06-08
•
Granted: 1954-09-21
•
Expires: 1969-06-08
Abstract
No abstract record available.
Inventors
- 👤 Clarence F Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:25
CPC Classifications
H; H04; H04R; H04R17/00; H04R17/04; H04R17/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US786509A
Cited
US1022126A
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US2197967A
Cited
US2201735A
Cited
US2261616A
Cited
US2479894A
Cited
US2451221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |