US2966656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spherical electro-acoustic transducer with internal heater
Assignee: Individual
•
Filing: 1956-08-02
•
Granted: 1960-12-27
•
Expires: 1976-08-02
Abstract
No abstract record available.
Inventors
- 👤 Claude R Bigbie
- 👤 Jr Elbert A Pence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:10
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0622; B06B1/0637
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2434255A
Cited
US2732536A
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US1480805A
Cited
US2565158A
Cited
US2640165A
Cited
US2556865A
Cited
US2565159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-27 | 1964-06-27 | 1964-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-27 | 1968-06-27 | 1968-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-27 | 1972-06-27 | 1972-12-27 | $7700.00 | Window Closed / Lapsed |