Camshaft
Abstract
Abstract A CAMSHAFT FOR INTERNAL COMBUSTION ENGINES MADE FROM AN ALLOY CONTAINING FROM 1.3% TO ABOUT 3.1% C, FROM ABOUT 15% TO ABOUT 35% CR WITH THE REMAINDER IRON, WITH OR WITHOUT UP TO ABOUT 3.25% SI, MN AND OTHER RESIDUALS. THE ALLOY IS CAST, COOLED SO A RELATIVELY SMALL NUMBER OF RELATIVELY LARGE PRIMARY CHROMIUM CARBIDE PARTICLES ARE FORMED AND WIDELY DISPERSED IN A MATRIX OF AUSTENITE CONTAINING A SOLID SOLUTION OF CHROMIUM AND CARBON. THEN LARGE NUMBERS OF RELATIVELY SMALL PARTICLES OF CHROMIUM CARBIDES ARE PRECIPITATED FROM THE MATRIX AND DISTRIBUTED THROUGHOUT THE SPACES BETWEEN THE LARGE PRIMARY CARBIDE PARTICLES LEAVING THE REMAINDER OF THE MATRIX CONTAINING CARBON AND SUSCEPTIBLE TO SUBSEQUENT HARDENING. THEN HARDENING THE CASTING BY HEATING AND SUBSEQUENTLY QUENCHING TO CONVERT THE MATRIX TO SUBSTANTIALLY A MARTENSITIC STRUCTURE WITHOUT SIGNIFICANTLY CHANGING THE CARBIDE PARTICLES.
Inventors
- 👤 Earl A Thompson
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |