US2680157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bone conduction telephone receiver
Assignee: FORTIPHONE Ltd
•
Filing: 1950-07-03
•
Granted: 1954-06-01
•
Expires: 1970-07-03
Abstract
No abstract record available.
Inventors
- 👤 Wolff Joachim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:01
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/60; H04R25/604; H04R25/606; H04R11/00; H04R11/02; H04R2460/00; H04R2460/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US990275A
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US1356156A
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US1404817A
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US1939922A
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GB396990A
Cited
US2062372A
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USRE21030E
Cited
US2000165A
Cited
US2264684A
Cited
US2410805A
Cited
US2459325A
Cited
US2500541A
Cited
US2463786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |