US2962397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making tappets
Assignee: Individual
•
Filing: 1957-09-19
•
Granted: 1960-11-29
•
Expires: 1977-09-19
Abstract
No abstract record available.
Inventors
- 👤 Earl A Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:01
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/12; F01L1/14; F01L1/16; C; C21; C21D; C21D1/00; C21D1/18; F01L3/00; F01L3/02; F01L2301/00; F01L2303/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
THE METHOD OF FROMING A HARD, TOUGH NON-SCUFFING VALVE TAPPET COMPRISING CASTING A PIECE FROM HARDENABLE ALLOY IRON CONTAINING ABOUT 2.9%C, 2.1% SI, TOGETHER WITH SUITABLE CARBIDE FORMING METALS IN SMALLER PERCENTAGES AND PROMPTLY THEREAFTER COOLING THE PIECE AT A RATE TO FORM MOTTLED IRON, HEAT TREATING THE PIECE AT BETWEEN 1700* AND 1800*F. FOR A PERIOD OF ABOUT 8 MINUTES, BUT MERELY SUFFICIENT TO BREAK DOWN THE HARD CARBIDE PARTICLES INTO SMALLER DISCRETE PARTICLES WITH LITTLE FORMATION OF GRAPHITE, THEN HEAT TREATING THE PIECE AT A TEMPERATURE APPROXIMATING 1300*F. TO CAUSE SEPARATE MOTTLED AREAS OF GRAPHITE TO FORM AND THEN QUENCHING THE PIECE TO PRODUCE A MARTENSITIC MATRIX HOLDING THE SMALLER CARBIDE PARTICLES AND INTERSPERSED WITH SEPARATED LARGE MOTTLED AREAS OF GRAPHITE CONCENTRATION.
Claim 2
Independent Claim
124 words
THE METHOD OF FROMING A HARD, TOUGH NON-SCUFFING VALVE TAPPET COMPRISING CASTING A PIECE FROM HARDENABLE ALLOY IRON CONTAINING ABOUT 2.9%C, 2.1% SI, TOGETHER WITH SUITABLE CARBIDE FORMING METALS IN SMALLER PERCENTAGES AND PROMPTLY THEREAFTER COOLING THE PIECE AT A RATE TO FORM MOTTLED IRON, HEAT TREATING THE PIECE AT BETWEEN 1700* AND 1800*F. FOR A PERIOD OF ABOUT 8 MINUTES, BUT MERELY SUFFICIENT TO BREAK DOWN THE HARD CARBIDE PARTICLES INTO SMALLER DISCRETE PARTICLES WITH LITTLE FORMATION OF GRAPHITE, THEN HEAT TREATING THE PIECE AT A TEMPERATURE APPROXIMATING 1300*F. TO CAUSE SEPARATE MOTTLED AREAS OF GRAPHITE TO FORM AND THEN QUENCHING THE PIECE TO PRODUCE A MARTENSITIC MATRIX HOLDING THE SMALLER CARBIDE PARTICLES AND INTERSPERSED WITH SEPARATED LARGE MOTTLED AREAS OF GRAPHITE CONCENTRATION.
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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) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |