Patent US3139533A successfully refreshed from Google Patents.
US3139533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternating currents phase and frequency comparator bridge using diode amplification effect
Assignee: Avco Corp
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Filing: 1960-06-08
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Granted: 1964-06-30
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Expires: 1980-06-08
Abstract
No abstract record available.
Inventors
- 👤 Raymond L Midkiff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:45
CPC Classifications
H; H03; H03D; H03D13/00; H03D13/007; H03D13/009
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
58 words
IN A PHASE-SENSITIVE SYSTEM, THE COMBINATION COMPRISING: FIRST AND SECOND SOURCES OF ALTERNATING CURRENTS; A LOAD; MEANS FOR PRODUCING AT SAID LOAD AN AMPLIFIED BEAT FREQUENCY OF SAID FIRST AND SECOND SOURCES, SAID MEANS COMPRISING FIRST AND SECOND OPPOSITELY POLED IMPEDANCE PATHS FROM SAID SOURCES THROUGH SAID LOAD, EACH OF SAID IMPEDANCE PATHS INCLUDING AT LEAST ONE SEMI-
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |