US2730472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing hollow tubular articles
Assignee: Ohio Crankshaft Co
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Filing: 1952-05-07
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Granted: 1956-01-10
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Expires: 1972-05-07
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry B Osborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:14
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/08; C21D1/00; C21D1/06; C21D1/09; C21D1/10; Y; Y02; Y02P; Y02P10/00; Y02P10/25; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49789; Y10T29/4979
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
THE METHOD OF MANUFACTURING HOLLOW, STEEL PISTON PINS HAVING A PREDETERMINED WALL THICKNESS AND LENGTH WHICH COMPRISES PROVIDING A SOLID, HOT-ROLLED BAR OF MEDIUM-CARBON STEEL; PARTIALLY SEVERING THE BAR AT LENGTHS ACCRDING T THE DESIRED LENGTH OF THE PISTON PIN AND TO DEPTHS IN EXCESS OF THE DESIRED FINAL WALL THICKNESS OF THE PISTON PIN; HEATING THE SURFACE OF SAID BAR TO TEMPERATURES ABOVE THE CRITICAL AND TO DEPTHS GENERALLY EQUALING THAT OF THE DESIRED WALL THICKNESS OF THE FINAL PISTON PIN; RAPID LY QUENCHING SAID SURFACE TO PROVIDE A HARDENED OUTER
Claim 2
Independent Claim
92 words
THE METHOD OF MANUFACTURING HOLLOW, STEEL PISTON PINS HAVING A PREDETERMINED WALL THICKNESS AND LENGTH WHICH COMPRISES PROVIDING A SOLID, HOT-ROLLED BAR OF MEDIUM-CARBON STEEL; PARTIALLY SEVERING THE BAR AT LENGTHS ACCRDING T THE DESIRED LENGTH OF THE PISTON PIN AND TO DEPTHS IN EXCESS OF THE DESIRED FINAL WALL THICKNESS OF THE PISTON PIN; HEATING THE SURFACE OF SAID BAR TO TEMPERATURES ABOVE THE CRITICAL AND TO DEPTHS GENERALLY EQUALING THAT OF THE DESIRED WALL THICKNESS OF THE FINAL PISTON PIN; RAPID LY QUENCHING SAID SURFACE TO PROVIDE A HARDENED OUTER
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) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |