US2931744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of grain refining centrifugal castings
Assignee: United States Pipe and Foundry Co LLC
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Filing: 1957-08-26
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Granted: 1960-04-05
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Expires: 1977-08-26
Abstract
No abstract record available.
Inventors
- 👤 Martin L Samuels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:28
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/30; C; C21; C21D; C21D8/00; C21D8/10; Y; Y10; Y10S; Y10S148/00; Y10S148/902; Y10S148/909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
THE METHOD FOR PRODUCING TUBULAR METAL ARTICLES OF A WORK-HARDENABLE DUCTILE METAL THE GRAIN SIZE OF WHICH CANNOT BE REDUCED BY HEAT TREATMENT ALONE, HAVING AN AVERAGE GRAIN SIZE NO LARGER THAN ASTM NO. 1 AND HAVING ISOTROPIC PHYSICAL PROPERTIES WHICH COMPRISES, EXPANDING A CENTRIFUGALLY CAST TUBE OF SAID METAL AT LEAST ABOUT 16 PERCENT IN OUTSIDE DIAMETER BY THE APPLICATION OF UNIFORM RADIAL PRESSURE SIMULTANEOUSLY THROUGHOUT THE INTERIOR OF SAID CAST TUBE WHILE THE OUTSIDE OF SAID CAST TUBE IS UNCONFINED, HEATING THE SO EXPANDED CAST TUBE
Claim 2
Independent Claim
88 words
THE METHOD FOR PRODUCING TUBULAR METAL ARTICLES OF A WORK-HARDENABLE DUCTILE METAL THE GRAIN SIZE OF WHICH CANNOT BE REDUCED BY HEAT TREATMENT ALONE, HAVING AN AVERAGE GRAIN SIZE NO LARGER THAN ASTM NO. 1 AND HAVING ISOTROPIC PHYSICAL PROPERTIES WHICH COMPRISES, EXPANDING A CENTRIFUGALLY CAST TUBE OF SAID METAL AT LEAST ABOUT 16 PERCENT IN OUTSIDE DIAMETER BY THE APPLICATION OF UNIFORM RADIAL PRESSURE SIMULTANEOUSLY THROUGHOUT THE INTERIOR OF SAID CAST TUBE WHILE THE OUTSIDE OF SAID CAST TUBE IS UNCONFINED, HEATING THE SO EXPANDED CAST TUBE
References Cited (Backward Citations)
US1692521A
Cited
US1552848A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |