US2664873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated metal product and method of producting same
Assignee: Shell Development Co
•
Filing: 1947-08-01
•
Granted: 1954-01-05
•
Expires: 1967-08-01
Abstract
No abstract record available.
Inventors
- 👤 Graham Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:22
CPC Classifications
F; F01; F01L; F01L3/00; F01L3/02; F01L3/04; C; C23; C23C; C23C2/00; C23C2/04; C23C2/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
88 words
A COATED ENGINE VALVE COMPRISING A BODY MADE ESSENTIALLY OF STEEL AND HAVING A PROTECTIVE COATING AT LEAST ON THAT PART WHICH IS EXPOSED TO ATTACK BY THE PRODUCTS OF COMBUSTION OF ENGINE FUEL, SAID COATING CONTAINING AT LEAST 55% ALUMINUM AND BETWEEN 30 AND 45% NICKEL AND BEING FORMED AND INTIMATELY BONDED TO THE STEEL BY INTERDIFFUSING AN OUTER METAL LAYER CONSISTING PREDOMINANTLY OF ALUMINUM WITH A THIN, INTERMEDIATE LAYER CONSISTING PREDOMINANTLY OF NICKEL BY PASSING AN ELECTRIC CURRENT THERETHROUGH AT A TEMPERATURE ABOVE ABOUT 600* C.
References Cited (Backward Citations)
GB230096A
Cited
US1637033A
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US1731202A
Cited
GB428855A
Cited
US2216519A
Cited
US2273250A
Cited
US2294803A
Cited
US2405222A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-04 | 1957-07-06 | 1958-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-04 | 1961-07-06 | 1962-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-04 | 1965-07-06 | 1966-01-05 | $7700.00 | Window Closed / Lapsed |