US3982907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat and wear resistant sintered alloy
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1974-10-31
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Granted: 1976-09-28
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Expires: 1994-10-31
Abstract
Abstract A heat and wear resistant sintered alloy produced by compacting and sintering a powdery mixture comprising, in percent by weight, C:0.2 - 2.0%, Cr:2.0 - 9.9%, Mo:0.3 - 1.5%, Co:3.0 - 10.0%, W:0.5 - 5.0% with the balance, totaling 100 wt.%, being substantially Fe.
Inventors
- 👤 Uichi Honma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:24
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0292; C22C38/00; C22C38/18; C22C38/40; C22C38/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A valve seat formed of a sintered alloy comprising, in percent by weight, 0.2-2.0% carbon, 2.0-9.9% chromium, 0.3-1.5% molybdenum, 3.0-10.0% cobalt, 0.5-5.0% tungsten with the balance, totalling 100 weight percent, being substantially Fe, said carbon being present as carbides of other elements in said alloy and said chromium forming carbide with carbon and tungsten in said alloy.
Claim 2
Dependent Claim
57 words
A valve seat formed of a sintered alloy comprising, in percent by weight, 0.2-2.0% carbon, 2.0-9.9% chromium, 0.3-1.5% molybdenum, 3.0-10.0% cobalt, 0.5-5.0% tungsten with the balance, totalling 100 weight percent, being substantially Fe, said carbon being present as carbides of other elements in said alloy and said chromium forming carbide with carbon and tungsten in said alloy.
References Cited (Backward Citations)
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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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |