US2992157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for loosening a pipe from a mandrel
Assignee: Johns Manville Corp
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Filing: 1958-12-03
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Granted: 1961-07-11
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Expires: 1978-12-03
Abstract
No abstract record available.
Inventors
- 👤 Kemener J Whalen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:17
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/90; B28B21/905; Y; Y10; Y10T; Y10T156/00; Y10T156/11; Y10T156/1111; Y10T156/19; Y10T156/1928
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A METHOD OF LOOSENING A WET PIPE FROM AN ELECTRICALLY CONDUCTIVE MANDREL COMPRISING WRAPPING AN ELECTRICALLY CONDUCTIVE SCREEN AROUND THE PIPE, FORMING AN ELECTRICAL CIRCUIT INCLUDING THE SCREEN, THE PIPE AND THE MANDREL AS SERIES ASSOCIATED ELEMENTS, AND LOOSENING THE PIPE FROM THE MANDREL BY PASSING AN ELECTRICAL DIRECT CURRENT THROUGH SAID CIRCUIT FLOWING IN THE DIRECTION FROM SAID SCREEN TOWARD SAID MANDREL WHILE MAINTAINING SAID PIPE AND SAID SCREEN SUBSTANTIALLY IMMOBILE RELATIVE TO EACH OTHER.
Claim 2
Independent Claim
76 words
A METHOD OF LOOSENING A WET PIPE FROM AN ELECTRICALLY CONDUCTIVE MANDREL COMPRISING WRAPPING AN ELECTRICALLY CONDUCTIVE SCREEN AROUND THE PIPE, FORMING AN ELECTRICAL CIRCUIT INCLUDING THE SCREEN, THE PIPE AND THE MANDREL AS SERIES ASSOCIATED ELEMENTS, AND LOOSENING THE PIPE FROM THE MANDREL BY PASSING AN ELECTRICAL DIRECT CURRENT THROUGH SAID CIRCUIT FLOWING IN THE DIRECTION FROM SAID SCREEN TOWARD SAID MANDREL WHILE MAINTAINING SAID PIPE AND SAID SCREEN SUBSTANTIALLY IMMOBILE RELATIVE TO EACH OTHER.
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) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |