Patent US2881312A successfully refreshed from Google Patents.
US2881312A
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Synchronous detector circuit
Assignee: HOGAN LAB Inc
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Filing: 1955-05-18
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Granted: 1959-04-07
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Expires: 1975-05-18
Abstract
No abstract record available.
Inventors
- 👤 Hugh C Ressler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:36
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/22; H03C; H03C1/00; H03C1/52; H03C1/54; H03C1/56; H03C1/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1959459A
Cited
GB465019A
Cited
US2263645A
Cited
US2414317A
Cited
US2462093A
Cited
US2600226A
Cited
FR980824A
Cited
US2751495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |