Patent US3377557A successfully refreshed from Google Patents.
US3377557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for phase-relationship analysis
Assignee: Individual
•
Filing: 1964-05-04
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Granted: 1968-04-09
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Expires: 1984-05-04
Abstract
No abstract record available.
Inventors
- 👤 Anthony D Heibel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:55
CPC Classifications
G; G01; G01R; G01R21/00; G01R21/08; G01R25/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
A METHOD OF SEPARATING AN ALTERNATING-CURRENT INPUT SIGNAL INTO COMPONENTS WHICH ARE IN-PHASE AND OUT-OFPHASE, RESPECTIVELY, WITH A REFERENCE ALTERNATING-CURRENT SIGNAL OF THE SAME FREQUENCY, COMPRISING: MULTIPLYING SAID SIGNALS TOGETHER AND BY A GAIN FACTOR TO PRODUCE A DIRECT-CURRENT TERM PROPORTIONAL TO THE IN-PHASE COMPONENT OF SAID INPUT SIGNAL, AND ANOTHER TERM; FILTERING OUT SAID OTHER TERM; MULTIPLYING SAID DIRECT-CURRENT TERM AND A REFERENCE ALTERNATING-CURRENT SIGNAL TOGETHER AND BY A GAIN FACTOR TO PRODUCE AN ALTERNATING-CURRENT TERM IN-PHASE WITH AND PROPORTIONAL TO THE IN-PHASE COMPONENT OF SAID INPUT SIGNAL; AND FEEDING BACK EXCLUSIVELY THAT PORTION OF SAID LATTER ALTERNATING-CURRENT TERM HAVING THE FREQUENCY OF SAID INPUT SIGNAL IN OPPOSITION TO SAID INPUT SIGNAL.
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) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |