US2632062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor transducer
Assignee: AT&T Inc
•
Filing: 1949-06-15
•
Granted: 1953-03-17
•
Expires: 1969-06-15
Abstract
No abstract record available.
Inventors
- 👤 Harold C Montgomery
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
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2472770A
Cited
US2486776A
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US2502479A
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US2502488A
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US2530745A
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US2497770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |