Patent US4274876A successfully refreshed from Google Patents.
US4274876A
Expired / Lapsed
US
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Sintered hard metals having high wear resistance
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1979-02-26
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Granted: 1981-06-23
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Expires: 1999-02-26
Abstract
Abstract The invention relates to sintered hard metals obtainable by mixing, pressing and sintering the powders of Cr: 0.2-5%, Ni: 0.5-10%, Mo: 4-12%, Co: 1-10% or C: 0.7-2%, iron powder within the scope of residual Fe, Fe-Mo, Cr-Mo-Co, Mo-Co, Ni-Mo-Cr alloy powders or a carbide powder having Vickers hardness higher than 400 as hard phase components, or calcium fluoride or barium fluoride. The invention has as its object the provision of sintered hard metals having the aforesaid composition for use in sliding members having high wear resistance and processability.
Inventors
- 👤 Yujiro Kodama
- 👤 Nobuhito Kuroishi
- 👤 Masato Sabao
- 👤 Yasumasa Kureha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:32
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0207; C22C33/0228
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
27 words
Sintered hard metals having high wear resistance and consisting essentially of Ni: 0.5-10%, Cr: 0.2-5%, Mo: 4-12% and C: 0.7-2.0%, each by weight, the remainder being iron.
Claim 2
Dependent Claim
27 words
Sintered hard metals having high wear resistance and consisting essentially of Ni: 0.5-10%, Cr: 0.2-5%, Mo: 4-12% and C: 0.7-2.0%, each by weight, the remainder being iron.
Claim 3
Dependent Claim
46 words
Sintered hard metals having high wear resistance as defined in claim 1 wherein sintered hard metal particles 20-70μ of Fe-Mo (Mo content 50-70 weight %) and Ni-Mo-Cr (Mo content 20-50 weight %; Cr content 5-30 weight %) are additionally present at 5-30 weight % in total.
Claim 4
Dependent Claim
19 words
Sintered hard metals having high wear resistance as defined in claim 1 containing 0.2-10 weight % of a fluoride.
Claim 5
Dependent Claim
21 words
Sintered hard metals having high wear resistance as defined in claim 3 wherein said fluoride is calcium fluoride or barium fluoride.
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) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |