Patent US2888523A successfully refreshed from Google Patents.
US2888523A
Expired / Lapsed
US
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Carrier frequency d.c. amplifier
Assignee: White Rodgers Co
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Filing: 1954-12-08
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Granted: 1959-05-26
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Expires: 1974-12-08
Abstract
No abstract record available.
Inventors
- 👤 Ross Donald Kenneth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:10
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/38; H03F3/40; H03K; H03K3/00; H03K3/02; H03K3/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB675268A
Cited
US2684999A
Cited
US2709205A
Cited
US2619552A
Cited
US2744969A
Cited
US2741668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |