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US3840439A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for measuring long cell corrosion rates

Assignee: Union Oil Company of California
•
Filing: 1972-04-12
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Granted: 1974-10-08
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Expires: 1992-04-12
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Abstract

Abstract 1. A METHOD FOR MEASURING LONG CELL CORROSIN CURRENT, WHICH COMPRISES: DISPOSING TWO METALLIC ELECTRODES IN SPACED RELATIONSHIP IN A CORROSIVE ELECTROLYTIC ENVIRONMENT; APPLYING ACROSS SAID ELECTRODES A FIRST D.C. POTENTIAL HAVING A VALUE OF LESS THAN 0.03 VOLT; MEASURING THE MAGNITUDE AND DIRECTION OF FIRST OBSERVED CURRENT FLOW BETWEEN SAID ELECTRODES FOR SAID FIRST APPLIED POTENTIAL; APPLYING ACROSS SAID ELECTRODES A SECOND D.C. POTENTIAL HAVING THE SAME VALUE LESS THAN 0.03 VOLT AND BEING OF OPPOSITE POLARITY TO SAID FIRST POTENTIAL; MEASURING THE MAGNITUDE AND DIRECTION OF A SECOND OBSERVED FLOW BETWEEN SAID ELECTRODES FOR SAID SECOND POTENTIAL; AND VECTORIALLY AVERAGING THE MEASURED VALUES OF SAID FIRST OBSERVED CURRENT AND SAID SECOND OBSERVED CURRENT TO OBTAIN A CURRENT VALUE CORRESPONDING TO THE LONG CELL CORROSION CURRENT. D R A W I N G

Inventors

  • 👤 G Marsh

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 07:53
CPC Classifications
G; G01; G01N; G01N17/00; G01N17/02

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 126 words
A METHOD FOR MEASURING LONG CELL CORROSIN CURRENT, WHICH COMPRISES: DISPOSING TWO METALLIC ELECTRODES IN SPACED RELATIONSHIP IN A CORROSIVE ELECTROLYTIC ENVIRONMENT; APPLYING ACROSS SAID ELECTRODES A FIRST D.C. POTENTIAL HAVING A VALUE OF LESS THAN 0.03 VOLT; MEASURING THE MAGNITUDE AND DIRECTION OF FIRST OBSERVED CURRENT FLOW BETWEEN SAID ELECTRODES FOR SAID FIRST APPLIED POTENTIAL; APPLYING ACROSS SAID ELECTRODES A SECOND D.C. POTENTIAL HAVING THE SAME VALUE LESS THAN 0.03 VOLT AND BEING OF OPPOSITE POLARITY TO SAID FIRST POTENTIAL; MEASURING THE MAGNITUDE AND DIRECTION OF A SECOND OBSERVED FLOW BETWEEN SAID ELECTRODES FOR SAID SECOND POTENTIAL; AND VECTORIALLY AVERAGING THE MEASURED VALUES OF SAID FIRST OBSERVED CURRENT AND SAID SECOND OBSERVED CURRENT TO OBTAIN A CURRENT VALUE CORRESPONDING TO THE LONG CELL CORROSION CURRENT.
Claim 2
Independent Claim 126 words
A METHOD FOR MEASURING LONG CELL CORROSIN CURRENT, WHICH COMPRISES: DISPOSING TWO METALLIC ELECTRODES IN SPACED RELATIONSHIP IN A CORROSIVE ELECTROLYTIC ENVIRONMENT; APPLYING ACROSS SAID ELECTRODES A FIRST D.C. POTENTIAL HAVING A VALUE OF LESS THAN 0.03 VOLT; MEASURING THE MAGNITUDE AND DIRECTION OF FIRST OBSERVED CURRENT FLOW BETWEEN SAID ELECTRODES FOR SAID FIRST APPLIED POTENTIAL; APPLYING ACROSS SAID ELECTRODES A SECOND D.C. POTENTIAL HAVING THE SAME VALUE LESS THAN 0.03 VOLT AND BEING OF OPPOSITE POLARITY TO SAID FIRST POTENTIAL; MEASURING THE MAGNITUDE AND DIRECTION OF A SECOND OBSERVED FLOW BETWEEN SAID ELECTRODES FOR SAID SECOND POTENTIAL; AND VECTORIALLY AVERAGING THE MEASURED VALUES OF SAID FIRST OBSERVED CURRENT AND SAID SECOND OBSERVED CURRENT TO OBTAIN A CURRENT VALUE CORRESPONDING TO THE LONG CELL CORROSION CURRENT.

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) 1977-10-07 1978-04-08 1978-10-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-10-07 1982-04-08 1982-10-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-10-07 1986-04-08 1986-10-08 $7700.00 Window Closed / Lapsed

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