US2979627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor switching circuits
Assignee: International Business Machines Corp
•
Filing: 1958-07-31
•
Granted: 1961-04-11
•
Expires: 1978-07-31
Abstract
No abstract record available.
Inventors
- 👤 Peter H Halpern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:56
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2846594A
Cited
US2845548A
Cited
US2843320A
Cited
US2885574A
Cited
US2909680A
Cited
US2923838A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |