US3108913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crankshafts and method of hardening same
Assignee: Ohio Crankshaft Co
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Filing: 1961-03-16
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Granted: 1963-10-29
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Expires: 1981-03-16
Abstract
No abstract record available.
Inventors
- 👤 Richard A Sommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:28
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/30; F; F16; F16C; F16C3/00; F16C3/04; F16C3/06; Y; Y10; Y10S; Y10S148/00; Y10S148/902; Y10S148/904; Y10T; Y10T74/00; Y10T74/21; Y10T74/2173
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
IN THE METHOD FOR HARDENING A SHAFT HAVING A GENERALLY CYLINDRICAL OUTER SURFACE AND ANNULAR FILLETS AT THE OPPOSITE ENDS OF THE CYLINDRICAL SURFACE, THE STEPS OF INDUCTIVELY HARDENING THE CYLINDRICAL SURFACE WITHOUT HARDENING THE ADJACENT FILLETS, AND THEREAFTER HARDENING THE FILLETS TO PROVIDE HARDENED AREAS WHICH ARE SPACED FROM THE HARDENED AREA OF THE CYLINDRICAL SURFACE TO LEAVE NARROW UNHARDENED BANDS BETWEEN THE HARDENED FILLETS AND THE PREVIOUSLY HARDENED CYLINDRICAL SURFACE.
Claim 2
Dependent Claim
72 words
IN THE METHOD FOR HARDENING A SHAFT HAVING A GENERALLY CYLINDRICAL OUTER SURFACE AND ANNULAR FILLETS AT THE OPPOSITE ENDS OF THE CYLINDRICAL SURFACE, THE STEPS OF INDUCTIVELY HARDENING THE CYLINDRICAL SURFACE WITHOUT HARDENING THE ADJACENT FILLETS, AND THEREAFTER HARDENING THE FILLETS TO PROVIDE HARDENED AREAS WHICH ARE SPACED FROM THE HARDENED AREA OF THE CYLINDRICAL SURFACE TO LEAVE NARROW UNHARDENED BANDS BETWEEN THE HARDENED FILLETS AND THE PREVIOUSLY HARDENED CYLINDRICAL SURFACE.
Claim 3
Dependent Claim
57 words
A CRANKSHAFT COMPRISED OF A CYLINDRICAL BEARING SURFACE AND A FILLET AT LEAST ON ONE END OF SAID SURFACE JOINING SAID SURFACE WITH A CHEEK, SAID FILLET AND SAID BEARING EACH HAVING A QUENCH HARDENED SURFACE, SAID TWO SURFACES BEING SPACED BY AN UNHARDENED PORTION HAVING A DUCTILITY CORRESPONDING TO THAT OF THE CORE OF THE BEARING.
Claim 4
Dependent Claim
57 words
A CRANKSHAFT COMPRISED OF A CYLINDRICAL BEARING SURFACE AND A FILLET AT LEAST ON ONE END OF SAID SURFACE JOINING SAID SURFACE WITH A CHEEK, SAID FILLET AND SAID BEARING EACH HAVING A QUENCH HARDENED SURFACE, SAID TWO SURFACES BEING SPACED BY AN UNHARDENED PORTION HAVING A DUCTILITY CORRESPONDING TO THAT OF THE CORE OF THE BEARING.
References Cited (Backward Citations)
US2292209A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-10-28 | 1967-04-29 | 1967-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-28 | 1971-04-29 | 1971-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-28 | 1975-04-29 | 1975-10-29 | $7700.00 | Window Closed / Lapsed |