US3588710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital phase detection circuitry
Assignee: Westinghouse Electric Corp
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Filing: 1968-08-05
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Granted: 1971-06-28
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Expires: 1988-08-05
Abstract
Abstract A SENSITIVE, DIGITAL, PHASE-DETECTION CIRCUIT INCORPORATING A PHASE-ERROR THRESHOLD. THE CIRCUIT CONVERTS TWO SINUSOIDAL SAMPLES OF VOLTAGE AND/OR CURRENT INTO DIGITAL FORM AND INSPECTS THEIR PHASE RELATIONSHIPS. AN OUTPUT INDICATES THE PHASE ERROR DIRECTION AND NOTIFIES AN EXTERNAL CIRCUIT WHENEVER THE PHASE DIFFERENCE EXCEEDS A PREDETERMINED VALUE. NO ADJUSTMENTS ARE REQUIRED, EVEN THOUGH INPUT LEVELS AND OPERATING FREQUENCIES MAY VARY OVER WIDE RANGES. NO DIGITAL CLOCKS OF ANY TYPE ARE USED. THE INFORMATION DETECTED MAY BE FED TO SERVO SYSTEMS, DISPLAY SYSTEMS, OR TO OTHER CONTROL DEVICES. MICROLOGIC ELEMENTS MAY BE ADVANTAGEOUSLY USED.
Inventors
- 👤 Harvey M Masters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:37
CPC Classifications
G; G01; G01R; G01R25/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |