US3738829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nickel alloy for automotive valve seats
Assignee: Nippon Piston Ring Co Ltd
•
Filing: 1971-06-15
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Granted: 1973-06-12
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Expires: 1991-06-15
Abstract
Abstract EXHAUST VALVE SEATS OF AN ALLOY DIFFERING FROM SMONEL BY SMALL AMOUNTS OF CARBON AND/OR LEAD DISPERSED IN THE BASE COMPONENT IN THE FORM OF A SEPARATE PHASE HAVE A MUCH LONGER USEFUL LIFE IN AUTOMOTIVE ENGINES FUELED WITH LEAD-FREE GASOLINE.
Inventors
- 👤 Y Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:59
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/002
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |