US2664874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated metal product and method of producing same
Assignee: Shell Development Co
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Filing: 1948-01-13
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Granted: 1954-01-05
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Expires: 1968-01-13
Abstract
No abstract record available.
Inventors
- 👤 Graham Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:09
CPC Classifications
C; C23; C23C; C23C2/00; C23C2/04; C23C10/00; C23C10/28; C23C2/12; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/935; Y10S428/941; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49314; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12757; Y10T428/12771; Y10T428/12861; Y10T428/12937; Y10T428/12944
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
A COATED ENGINE VALVE COMPRISING A BODY MADE OF A BASE METAL AND HAVING A PROTECTIVE COATING ON AT LEAST THAT PART THEREOF WHICH IS EXPOSED TO ATTACK BY THE PRODUCTS OF COMBUSTION OF ENGINE FUEL, SAID COATING BEING THE INTERDIFFUSION PRODUCT WITH SAID BASE METAL OF A THIN EXTERNAL LAYER CONTAINING FROM 50% TO 70% OF ALUMINUM, FROM 5% TO 45% OF NICKEL, AND FROM 5% TO 35% OF COBALT, SAID COATING BEING RESISTANT TO ATTACK BY LEAD COMPOUNDS PRESENT IN PRODUCTS OF COMBUSTION OF MOTOR FUELS CONTAINING TETRAETHYL LEAD.
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) | 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 |