Patent US3871525A successfully refreshed from Google Patents.
Patent US3802852A successfully refreshed from Google Patents.
US3802852A
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Sintered alloys having wear resistance at high temperature comprising a sintered femo-c alloy skeleton infiltrated with cu or pb base alloys or sb
Assignee: Toyota Motor Corp
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Filing: 1972-01-11
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Granted: 1974-04-09
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Expires: 1992-01-11
Abstract
Abstract The present invention relates to sintered alloys having wear resistance at high temperature, particularly suitable for fabricating valve seats of internal combustion engines. The pores of iron-base sintered skeletons are infiltrated with selected molten metals or with alloys thereof.
Inventors
- 👤 I Niimi
- 👤 K Imanishi
- 👤 Y Serino
- 👤 S Mitani
- 👤 K Hashimoto
- 👤 K Ushitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:00
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0242; F; F01; F01L; F01L3/00; F01L3/22; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/1216; Y10T428/12167; Y10T428/12174
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
17 words
A valve seat for an internal combustion engine fabricated of the wear resistant metal of claim 1.
Claim 2
Dependent Claim
28 words
The wear resistant metal of claim 1 in which the copper-base alloy infiltrant includes at least one metal selected from the group consisting of chromium, tin and zinc.
Claim 3
Dependent Claim
17 words
A valve seat for an internal combustion engine fabricated of the wear resistant metal of claim 3.
Claim 4
Dependent Claim
29 words
The wear resistant metal of claim 1 in which the copper-lead base alloy infiltrant includes at least one metal selected from the group consisting of chromium, tin and zinc.
Claim 5
Dependent Claim
17 words
A valve seat for an internal combustion engine fabricated of the wear resistant metal of claim 5.
Claim 6
Dependent Claim
28 words
The wear resistant metal of claim 1 in which the lead-base alloy infiltrant includes at least one metal selected from the group consisting of bismuth, antimony and cadmium.
Claim 7
Dependent Claim
17 words
A valve seat for an internal combustion engine fabricated of the wear resistant metal of claim 7.
Claim 8
Dependent Claim
42 words
A wear resistant metal comprising a sintered skeleton consisting essentially of iron having 0.25 to 8 percent by weight molybdenum and 0.1 to 1.0 percent by weight carbon, and an infiltrant consisting of 5 to 30 percent by weight copper-lead base alloy.
Claim 9
Dependent Claim
17 words
A valve seat for an internal combustion engine fabricated of the wear resistant metal of claim 9.
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) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |