US3210655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolyte method and apparatus for detecting holidays in the internal coatings of pipes
Assignee: ConocoPhillips Co
•
Filing: 1960-08-29
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Granted: 1965-10-05
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Expires: 1980-08-29
Abstract
No abstract record available.
Inventors
- 👤 Robert L Mcglasson
- 👤 James E Landers
- 👤 Walton D Greathouse
- 👤 Earl D Gould
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:45
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/20; G01N27/205
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A METHOD OF LOCATING HOLIDAYS IN AN INTERNAL COATING OF INSULATING MATERIAL IN A TUBULAR MEMBER, COMPRISING THE STEPS OF: (A) FILLING THE TUBULAR MEMBER WITH AN ELECTROLYTE, (B) SUPPORTING THREE ELECTRODES IN THE TUBULAR MEMBER IN SUBSTANTIALLY EQUALLY SPACED APART RELATION SUBSTATNIALLY ALONG THE CENTERLINE OF THE TUBULAR MEMBER, (C) IMPOSING ONE POTENTIAL ON THE CENTRALLY POSITIONED ELECTRODE AND A SECOND, DIFFERENT POTENTIAL ON THE ENDMOST ELECTRODES TO PROVIDE A POTENTIAL GRADIENT IN THE ELECTROLYTE BETWEEN SAID ELECTRODES, (D) MOVING THE ELECTRODES IN THEIR SPACED RELATION THROUGH THE TUBULAR MEMBER, AND (E) REGISTERING VARIATIONS IN THE POTENTIAL DIFFERENCE BETWEEN AT LEAST ONE OF SAID ELECTRODES AND THE TUBULAR MEMBER DURING MOVEMENT OF SAID ELECTRODES THROUGH THE TUBULAR MEMBER.
Claim 2
Independent Claim
119 words
A METHOD OF LOCATING HOLIDAYS IN AN INTERNAL COATING OF INSULATING MATERIAL IN A TUBULAR MEMBER, COMPRISING THE STEPS OF: (A) FILLING THE TUBULAR MEMBER WITH AN ELECTROLYTE, (B) SUPPORTING THREE ELECTRODES IN THE TUBULAR MEMBER IN SUBSTANTIALLY EQUALLY SPACED APART RELATION SUBSTATNIALLY ALONG THE CENTERLINE OF THE TUBULAR MEMBER, (C) IMPOSING ONE POTENTIAL ON THE CENTRALLY POSITIONED ELECTRODE AND A SECOND, DIFFERENT POTENTIAL ON THE ENDMOST ELECTRODES TO PROVIDE A POTENTIAL GRADIENT IN THE ELECTROLYTE BETWEEN SAID ELECTRODES, (D) MOVING THE ELECTRODES IN THEIR SPACED RELATION THROUGH THE TUBULAR MEMBER, AND (E) REGISTERING VARIATIONS IN THE POTENTIAL DIFFERENCE BETWEEN AT LEAST ONE OF SAID ELECTRODES AND THE TUBULAR MEMBER DURING MOVEMENT OF SAID ELECTRODES THROUGH THE TUBULAR MEMBER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |