US3287801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for lining pipe under pressure
Assignee: Pan American Petroleum Corp
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Filing: 1962-11-26
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Granted: 1966-11-29
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Expires: 1982-11-26
Abstract
No abstract record available.
Inventors
- 👤 Kenneth A Blenkarn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:04
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/02; F16L58/04; F16L58/06; B; B28; B28B; B28B19/00; B28B19/0023; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49888
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
83 words
IN THE METHOD OF LINING PIPE WITH CEMENT WHEREIN A CEMENT SLURRY IS CENTRIFUGALLY CAST IN SAID PIPE UNDER INTERNAL FLUID PRESSURE AND SAID PRESSURE IS MAINTAINED UNTIL SAID CEMENT HAS DEVELOPED A COMPRESSIVE STRENGTH SUFFICIENT TO RESIST COLLAPSE BY SAID PIPE WHEN SAID PRESSURE IS RELEASED, THE IMPROVEMENT COMPRISING: RESTRAINED DIFFERENTIAL MOVEMENT OF SAID PIPE AND SAID FLUID LINING WHEN SAID CASTING PRESSURE IS RELEASED THEREFROM BY INTERNALLY UPSETTING THE ENDS OF SAID PIPE BEFORE CASTING SAID CEMENT SLURRY IN SAID PIPE.
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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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |