US3863318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature-resistant wearproof sintered alloys
Assignee: Toyota Motor Corp
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Filing: 1973-03-01
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Granted: 1975-02-04
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Expires: 1993-03-01
Abstract
Abstract This invention relates to iron base sintered alloys which excel in high temperature resistance and wear resistance and are especially suited for use in the valve seats of an internal combustion engine. These high temperature-resistant, wear resistant sintered alloys are characterized by the fact that they contain Fe as their main component, together with Mo 3-20%, C 0.5-1.5%, Co 3-25% and Pb 1-15% by weight; and that the Fe matrix has very hard particles, which contain intermediate phase Epsilon , and Pb dispersed therein.
Inventors
- 👤 Itaru Niimi
- 👤 Kametaro Hashimoto
- 👤 Kenji Ushitani
- 👤 Yoichi Serino
- 👤 Tetsuya Suganuma
- 👤 Seishu Mitani
- 👤 Kunizo Imanishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:03
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
15 words
Alloy as claimed in claim 1 in which said molybdenum-containing particles comprise an epsilon phase.
Claim 2
Dependent Claim
15 words
Alloy as claimed in claim 1 in which said matrix contains less than 3% molybdenum.
Claim 3
Dependent Claim
10 words
Alloy as claimed in claim 3 containing from 5-15% molybdenum.
Claim 4
Dependent Claim
10 words
Alloy as claimed in claim 1 containing from 1-15% nickel.
Claim 5
Dependent Claim
9 words
Alloy as claimed in claim 1 containing 3-25% chromium.
Claim 6
Dependent Claim
19 words
Alloy as claimed in claim 1 containing nickel and chromium in a total amount lying between 2 and 30%.
Claim 7
Dependent Claim
18 words
Alloy as claimed in claim 1 containing molybdenum and chromium in a total amount of at least 18%.
Claim 8
Dependent Claim
19 words
Alloy as claimed in claim 1 in which said alloy has a Vickers hardness lying between 150 and 330.
Claim 9
Dependent Claim
32 words
Alloy as claimed in claim 1 consisting essentially of the constituents claimed in claim 1, and at least one additional ingredient selected from the group consisting of 1-15% nickel and 3-25% chromium.
References Cited (Backward Citations)
US1790704A
Cited
US3729293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |