US3372244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductive transducers
Assignee: AT&T Inc
•
Filing: 1966-07-07
•
Granted: 1968-03-05
•
Expires: 1986-07-07
Abstract
No abstract record available.
Inventors
- 👤 Mathew E Sikorski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:21
CPC Classifications
H; H04; H04R; H04R23/00; H04R23/006; H10; H10D; H10D99/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2549550A
Cited
US2530745A
Cited
US2632062A
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US2929885A
Cited
US3107277A
Cited
US3236957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |