US2545507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double-bridge push-pull differential amplifier
Assignee: Individual
•
Filing: 1948-06-11
•
Granted: 1951-03-20
•
Expires: 1968-06-11
Abstract
No abstract record available.
Inventors
- 👤 John E Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:39
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/26; H03F3/28; H03F1/00; H03F1/34; H03F1/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1822922A
Cited
US2232212A
Cited
US2310342A
Cited
US2288600A
Cited
US2329073A
Cited
US2424893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-19 | 1954-09-18 | 1955-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-19 | 1958-09-18 | 1959-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-19 | 1962-09-18 | 1963-03-20 | $7700.00 | Window Closed / Lapsed |