US3284702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting coating holidays in metal pipeline walls utilizing helically wound pick-up coils and selfcontained power system
Assignee: Camco Inc
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Filing: 1963-04-26
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Granted: 1966-11-08
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Expires: 1983-04-26
Abstract
No abstract record available.
Inventors
- 👤 Warren G Ownby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:14
CPC Classifications
G; G01; G01N; G01N17/00; C; C23; C23F; C23F13/00; C23F13/02; C23F13/04; G01N27/00; G01N27/02; G01N27/04; G01N27/20; G01N27/72; G01N27/82; G01N27/90; G01N27/9093; F; F16; F16L; F16L2101/00; F16L2101/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
AN APPARATUS FOR DETECTING COATING HOLIDAYS IN A PROTECTIVELY COATED METALLIC WALL PIPELINE BURIED IN THE GROUND IN WHICH A CATHODIC PORTECTIVE SYSTEM HAVING ONE TERMINAL DIRECTLY CONNECTED TO THE METALLIC WALL AND THE OTHER TERMINAL ACTIVE THROUGH THE GROUND OVER A GIVEN LENGTH OF COATED PIPELINE WHEREBY A CIRCUIT OF CATHODIC CURRENT WILL BE COMPLETED THROUGH THE WALL UPON CURRENT PASSAGE INTO THE WALL AT THE OCCURENCE OF A COATING HOLIDAY COMPRISING, A MAGNETIC FLUX DETECTOR ADAPTED TO BE RUN THROUGH SAID GIVEN LENGTH OF PIPELINE IN A TRAVERSING RELATION WITH THE METALLIC WALL, AN ELECTRICALLY ACTUATED FLUX MEASURING RECORDER CONNECTED TO SAID DETECTOR, A BATTERY CONNECTED TO THE RECORDER, CURRENT GENERATING MEANS CONNECTED TO THE BATTERY FOR CHARGING THE BATTERY, AND DRIVE MECHANISM FOR THE GENERATING MEANS ENGAGEABLE WITH THE METALLIC WALL AND ARRANGED FOR DRIVING THE GENERATING MEANS IN RESPONSE TO TRAVEL OF THE APPARATUS RELATIVE TO THE PIPELINE.
Claim 2
Independent Claim
152 words
AN APPARATUS FOR DETECTING COATING HOLIDAYS IN A PROTECTIVELY COATED METALLIC WALL PIPELINE BURIED IN THE GROUND IN WHICH A CATHODIC PORTECTIVE SYSTEM HAVING ONE TERMINAL DIRECTLY CONNECTED TO THE METALLIC WALL AND THE OTHER TERMINAL ACTIVE THROUGH THE GROUND OVER A GIVEN LENGTH OF COATED PIPELINE WHEREBY A CIRCUIT OF CATHODIC CURRENT WILL BE COMPLETED THROUGH THE WALL UPON CURRENT PASSAGE INTO THE WALL AT THE OCCURENCE OF A COATING HOLIDAY COMPRISING, A MAGNETIC FLUX DETECTOR ADAPTED TO BE RUN THROUGH SAID GIVEN LENGTH OF PIPELINE IN A TRAVERSING RELATION WITH THE METALLIC WALL, AN ELECTRICALLY ACTUATED FLUX MEASURING RECORDER CONNECTED TO SAID DETECTOR, A BATTERY CONNECTED TO THE RECORDER, CURRENT GENERATING MEANS CONNECTED TO THE BATTERY FOR CHARGING THE BATTERY, AND DRIVE MECHANISM FOR THE GENERATING MEANS ENGAGEABLE WITH THE METALLIC WALL AND ARRANGED FOR DRIVING THE GENERATING MEANS IN RESPONSE TO TRAVEL OF THE APPARATUS RELATIVE TO THE PIPELINE.
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) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |