Patent US3291881A successfully refreshed from Google Patents.
US3291881A
Expired / Lapsed
US
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Threaded pipe construction method
Assignee: Rock Island Oil and Refining Co Inc
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Filing: 1962-10-12
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Granted: 1966-12-13
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Expires: 1982-10-12
Abstract
No abstract record available.
Inventors
- 👤 Vesta F Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:49
CPC Classifications
B; B29; B29D; B29D23/00; B29D23/001; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/583; B29C53/585; B29C53/80; B29C53/8008; B29C53/8016; B29C53/805; B29D1/00; B29D1/005; F; F16; F16L; F16L47/00; F16L47/16; F16L9/00; F16L9/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A METHOD FOR FORMING MALE THREADS ON THE PIN END OF AN ELONGATE MEMBER HAVING AN UNCURED OUTERMOST RESIN SURFACE, COMPRISING THE STEPS OF LONGITUDINALLY MOVING A CENTRALLY APERTURED THREADED MOLD HAVING INTERNAL THREAD-FORMING PORTIONS FILLED WITH A HARDENABLE THREADFORMING SUBSTANCE INWARDLY OVER THE END PORTION OF THE ELONGATE PIPE MEMBER ABOUT WHICH MALE THREADS ARE TO VBE FORMED, FORCING UNCURED RESIN OF THE PIPE SURFACE INTO THE INTERVAL BETWEEN THE MOLD AND THE PIPE AT THE END OF THE MOLD DISPOSED TOWARD THE ADJACENT PIPE DISTAL END LIMIT SO AS TO PROVIDE FLUID PRESSURE TO THE HARDENABLE THREADFORMING SUBSTANCE FILLING THE MOLD THREAD-FORMING PORTIONS WHEREBY AIR ENTRAPMENT BETWEEN SAID MOLD AND PIPE PIN END IS AVOIDED, AND REMOVING SAID MOLD FROM SAID ELONGATE PIPE MEMBER.
Claim 2
Independent Claim
126 words
A METHOD FOR FORMING MALE THREADS ON THE PIN END OF AN ELONGATE MEMBER HAVING AN UNCURED OUTERMOST RESIN SURFACE, COMPRISING THE STEPS OF LONGITUDINALLY MOVING A CENTRALLY APERTURED THREADED MOLD HAVING INTERNAL THREAD-FORMING PORTIONS FILLED WITH A HARDENABLE THREADFORMING SUBSTANCE INWARDLY OVER THE END PORTION OF THE ELONGATE PIPE MEMBER ABOUT WHICH MALE THREADS ARE TO VBE FORMED, FORCING UNCURED RESIN OF THE PIPE SURFACE INTO THE INTERVAL BETWEEN THE MOLD AND THE PIPE AT THE END OF THE MOLD DISPOSED TOWARD THE ADJACENT PIPE DISTAL END LIMIT SO AS TO PROVIDE FLUID PRESSURE TO THE HARDENABLE THREADFORMING SUBSTANCE FILLING THE MOLD THREAD-FORMING PORTIONS WHEREBY AIR ENTRAPMENT BETWEEN SAID MOLD AND PIPE PIN END IS AVOIDED, AND REMOVING SAID MOLD FROM SAID ELONGATE PIPE 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) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |