Patent US1635452A successfully refreshed from Google Patents.
Patent US2757243A successfully refreshed from Google Patents.
US2757243A
Expired / Lapsed
US
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Transistor circuits
Assignee: AT&T Inc
•
Filing: 1951-09-17
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Granted: 1956-07-31
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Expires: 1971-09-17
Abstract
No abstract record available.
Inventors
- 👤 Donald E Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:55
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/302; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3385; H03B; H03B7/00; H03B7/02; H03B7/06; H03L; H03L3/00
Claims Analysis
Total Claims: 0
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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) | 1959-07-31 | 1960-01-30 | 1960-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-31 | 1964-01-30 | 1964-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-31 | 1968-01-30 | 1968-07-31 | $7700.00 | Window Closed / Lapsed |