US3142631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathodic protection circuit
Assignee: Engelhard Industries Inc
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Filing: 1961-03-07
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Granted: 1964-07-28
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Expires: 1981-03-07
Abstract
No abstract record available.
Inventors
- 👤 George V Woodley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:56
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C23F13/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN COMBINATION, A CATHODIC PROTECTION POWER SUPPLY SYSTEM WITH ADJUSTABLE OUTPUT FOR CATHODICALLY PROTECTING A METAL SURFACE, A REFERENCE ELECTRODE MOUNTED IN SPACED RELATIONSHIP WITH RESPECT TO SAID SURFACE AND CONSTITUTING TOGETHER WITH SAID SURFACE A SENSING MEANS FOR DEVELOPING A SIGNAL REPRESENTING CATHODIC PROTECTION CONDITIONS HAVING A POWER LEVEL OF THE ORDER OF 10**-9 WATTS, A SECONDHARMONIC MAGNETIC AMPLIFIER, MEANS FOR APPLYING THE SIGNAL TO THE AMPLIFIER CONTROL WINDINGS, AND MEANS FOR ADJUSTING THE POWER OUTPUT AS A FUNCTION OF THE AMPLIFIER OUTPUT.
Claim 2
Dependent Claim
84 words
IN COMBINATION, A CATHODIC PROTECTION POWER SUPPLY SYSTEM WITH ADJUSTABLE OUTPUT FOR CATHODICALLY PROTECTING A METAL SURFACE, A REFERENCE ELECTRODE MOUNTED IN SPACED RELATIONSHIP WITH RESPECT TO SAID SURFACE AND CONSTITUTING TOGETHER WITH SAID SURFACE A SENSING MEANS FOR DEVELOPING A SIGNAL REPRESENTING CATHODIC PROTECTION CONDITIONS HAVING A POWER LEVEL OF THE ORDER OF 10**-9 WATTS, A SECONDHARMONIC MAGNETIC AMPLIFIER, MEANS FOR APPLYING THE SIGNAL TO THE AMPLIFIER CONTROL WINDINGS, AND MEANS FOR ADJUSTING THE POWER OUTPUT AS A FUNCTION OF THE AMPLIFIER OUTPUT.
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) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |