Patent US3977838A successfully refreshed from Google Patents.
US3977838A
Expired / Lapsed
US
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Anti-wear ferrous sintered alloy
Assignee: Toyota Motor Corp
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Filing: 1974-06-11
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Granted: 1976-08-31
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Expires: 1994-06-11
Abstract
Abstract The present invention relates to an anti-wear ferrous sintered alloy composed of carbon, molybdenum, phosphorus, boron, and, if desired, copper, and the balance iron.
Inventors
- 👤 Kametaro Hashimoto
- 👤 Kenji Ushitani
- 👤 Masashi Shibata
- 👤 Yasuo Takeda
- 👤 Yoshitaka Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:08
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/057; H01F1/0571; H01F1/0572
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
27 words
Anti-wear ferrous sintered alloy consisting essentially of 0.5-2.0% carbon, 3-18% molybdenum, 0.8-3.0% phosphorus, 0.02-0.3% boron, and 0- 10% copper, by weight, with the balance substantially all iron.
Claim 2
Dependent Claim
27 words
Anti-wear ferrous sintered alloy consisting essentially of 0.5-2.0% carbon, 3-18% molybdenum, 0.8-3.0% phosphorus, 0.02-0.3% boron, and 0- 10% copper, by weight, with the balance substantially all iron.
Claim 3
Dependent Claim
29 words
Anti-wear alloy as claimed in claim 1 in which said alloy comprises a steadite precipitate in a bainite matrix with molybdenum and boron in solid solution in said steadite.
Claim 4
Dependent Claim
29 words
Anti-wear alloy as claimed in claim 1 in which said alloy comprises a steadite precipitate in a martensite matrix with molybdenum and boron in solid solution in said steadite.
Claim 5
Dependent Claim
10 words
Anti-wear alloy as claimed in claim 1 comprising 0.1-10% copper.
Claim 6
Dependent Claim
45 words
Anti-wear alloy as claimed in claim 1 formed from the following powders: graphite having a particle size of 2-3 microns and providing said carbon, molybdenum powder having a particle size of 5-6 microns, -200mesh ferro-alloys providing said phosphorus and boron, and -150 mesh iron powder.
Claim 7
Dependent Claim
10 words
A valve seat made from the alloy of claim 1.
Claim 8
Dependent Claim
10 words
A valve lifter made from the alloy of claim 1.
Claim 9
Dependent Claim
10 words
A valve seal made from the alloy of claim 1.
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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) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |