US2936345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High efficiency direct current power amplifier
Assignee: Bell and Howell Co
•
Filing: 1954-07-06
•
Granted: 1960-05-10
•
Expires: 1974-07-06
Abstract
No abstract record available.
Inventors
- 👤 John F Kinkel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:41
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/42; H03F3/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1985923A
Cited
US2329073A
Cited
US2431973A
Cited
US2670410A
Cited
US2761019A
Cited
US2783314A
Cited
US2677729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-10 | 1963-11-09 | 1964-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-10 | 1967-11-09 | 1968-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-10 | 1971-11-09 | 1972-05-10 | $7700.00 | Window Closed / Lapsed |