Patent US3790352A successfully refreshed from Google Patents.
US3790352A
Expired / Lapsed
US
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Sintered alloy having wear resistance at high temperature
Assignee: Individual
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Filing: 1972-01-11
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Granted: 1974-02-05
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Expires: 1992-01-11
Abstract
Abstract The present invention relates to iron-base sintered alloys having excellent wear resistance at high temperatures, and more particularly to alloys adapted for fabricating valve seat rings of internal combustion engines. The alloys of the present invention are characterized by infiltrating selected metals having lubricating properties or the alloys thereof into the pores of iron-chromium-carbon base sintered alloys having significant mechanical strength and heat resistance.
Inventors
- 👤 K Hashimoto
- 👤 K Ushitani
- 👤 Y Serino
- 👤 S Mitani
- 👤 I Niimi
- 👤 K Imanishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:33
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0242; F; F01; F01L; F01L3/00; F01L3/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49306; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/1216; Y10T428/12167
Claims Analysis
Total Claims: 11
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 tin, zinc and chromium.
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
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 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
42 words
A wear resistant metal comprising a sintered skeleton consisting essentially of iron having 0.2 to 15 percent by weight chromium and 0.2 to 1.0 percent by weight carbon, and an infiltrant consisting of 5 to 30 percent by weight copper-lead base alloy.
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
23 words
The wear resistant metal of claim 7 in which the copper-lead base alloy infiltrant comprises 5 to 30 percent by weight copper-lead alloy.
Claim 9
Dependent Claim
17 words
A valve seat for an internal combustion engine fabricated of the wear resistant metal of claim 9.
Claim 10
Dependent Claim
29 words
The wear resistant metal of claim 7 in which the copper-lead base alloy infiltrant includes at least one metal selected from the group consisting of tin, zinc and chromium.
Claim 11
Dependent Claim
17 words
A valve seat for an internal combustion engine fabricated of the wear resistant metal of claim 11.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |