US2963592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor switching circuit
Assignee: AT&T Inc
•
Filing: 1956-05-11
•
Granted: 1960-12-06
•
Expires: 1976-05-11
Abstract
No abstract record available.
Inventors
- 👤 Graaf David A De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:09
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/04; H03K17/041; H03K17/0412; H03K17/04126
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2681996A
Cited
US2594336A
Cited
GB736760A
Cited
US2736765A
Cited
US2854589A
Cited
US2912597A
Cited
US2897378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-06 | 1964-06-06 | 1964-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-06 | 1968-06-06 | 1968-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-06 | 1972-06-06 | 1972-12-06 | $7700.00 | Window Closed / Lapsed |