US2549550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration-operated transistor
Assignee: AT&T Inc
•
Filing: 1948-08-19
•
Granted: 1951-04-17
•
Expires: 1968-08-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert L Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:46
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/04; H10; H10D; H10D99/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US918487A
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US1691358A
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US1759967A
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US1754175A
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US1877140A
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US1871253A
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US2165981A
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US2328478A
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US2402661A
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US2430028A
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US2402515A
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US2387472A
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US2418516A
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US2472770A
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US2486776A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |