US3694173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferrous alloys
Assignee: Federal Mogul Coventry Ltd
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Filing: 1971-05-27
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Granted: 1972-09-26
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Expires: 1991-05-27
Abstract
Abstract A SINTERED FERROUS ALLOY HAS THE COMPOSITION CHROMIUM 10.5-15%, CARBON 0.5-2.5%, MOLYBDENUM 0.25-5.0%, COPPER 3-25%, THE REMAINDER BEING IRON EXCEPT FOR USUAL IMPURITIES AND TRACE ELEMENTS. THE ALLOY CAN ALSO CONTAIN UP TO A TOTAL OF 5% TITANIUM, VANADIUM AND/OR COBALT. THE CHROMIUM IS INTRODUCED IN THE FORM OF A PRE-ALLOY OF 87% IRON AND 13% CHROMIUM, AND THE COPPER CAN BE INTRODUCED IN THE FORM OF A PRE-ALLOY OF 90% COPPER, 5% IRON AND 5% MANGANESE. THE ALLOY IS USEFUL FOR THE PRODUCTION, BY POWDER METALLURGY, OF VALVE SEAT INSERTS FOR INTERNAL COMBUSTION ENGINES.
Inventors
- 👤 Edwin B Farmer
- 👤 Terence M Cadle
- 👤 Martyn S Lane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:58
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/20; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/1216
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |