Patent US3243986A successfully refreshed from Google Patents.
US3243986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of large diameter thin-walled tubing
Assignee: HALSTEAD METAL PRODUCTS Inc
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Filing: 1963-10-01
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Granted: 1966-04-05
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Expires: 1983-10-01
Abstract
No abstract record available.
Inventors
- 👤 Delorma M Douthett
- 👤 George A Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:17
CPC Classifications
B; B21; B21C; B21C1/00; B21C1/16; B21C1/22; B21C1/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN THE METHOD FOR PRODUCING TUBULAR SHAPES OF PREDETERMINED INNER AND OUTER DIMENSIONS FROM THICK-WALLED TUBULAR BLOOMS, THE STEPS OF FIRST EXPANDING BOTH THE INNER AND OUTER DIMENSIONS OF SAID BLOOM ALONG ITS ENTIRE AXIAL LENGTH EXCEPT AT ONE END THEREOF WHEREBY THE EXPANDED OUTER DIMENSIONS WILL BE AT LEAST SLIGHTLY LARGER THAN SAID PREDETERMINED OUTER DIMENSIONS, THEREAFTER PASSING SAID ONE END OF THE BLOOM WHICH HAD NOT BEEN EXPANDED THROUGH A DRAWING DIE HAVING A PERIMETER OF DI-
Claim 2
Dependent Claim
79 words
IN THE METHOD FOR PRODUCING TUBULAR SHAPES OF PREDETERMINED INNER AND OUTER DIMENSIONS FROM THICK-WALLED TUBULAR BLOOMS, THE STEPS OF FIRST EXPANDING BOTH THE INNER AND OUTER DIMENSIONS OF SAID BLOOM ALONG ITS ENTIRE AXIAL LENGTH EXCEPT AT ONE END THEREOF WHEREBY THE EXPANDED OUTER DIMENSIONS WILL BE AT LEAST SLIGHTLY LARGER THAN SAID PREDETERMINED OUTER DIMENSIONS, THEREAFTER PASSING SAID ONE END OF THE BLOOM WHICH HAD NOT BEEN EXPANDED THROUGH A DRAWING DIE HAVING A PERIMETER OF DI-
References Cited (Backward Citations)
US307993A
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US1124757A
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US1973031A
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US2234863A
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US2965965A
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US3173196A
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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) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |