Patent US4182299A successfully refreshed from Google Patents.
US4182299A
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Engine valve
Assignee: Caterpillar Inc
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Filing: 1978-06-26
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Granted: 1980-01-08
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Expires: 1998-06-26
Abstract
Abstract An engine valve has a valve body, a valve head, an annular metallic valve seat layer fusibly bonded to the valve head that has a relatively fine crystalline structure, and a thinner region of interstitial bond between the valve head and the valve seat layer than heretofore known.
Inventors
- 👤 Michael Earle
- 👤 Glenn H. Lenzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:14
CPC Classifications
F; F01; F01L; F01L3/00; F01L3/02; F01L3/04; B; B23; B23K; B23K26/00; B23K26/20; B23K26/32; B23K26/34; B23K35/00; B23K35/001; B23K35/004; B32; B32B; B32B15/00; B32B15/01; C; C22; C22C; C22C38/00; C22C38/18; B23K2103/00; B23K2103/50; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49314
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
An engine valve comprising: a valve head of an alloy steel base material; an annular valve seat layer of a metallic alloy material different than the alloy steel base material, the valve seat layer being fusibly bonded to the valve head by a beam of electromagnetic energy; and a region of interstitial bond between the valve head and the valve seat layer having a thickness of about 0.003" (0.075 mm), having properties derived from both the alloy steel base material and the metallic alloy material, and defining a relatively abrupt descendency of the relative concentration of iron from the amount present in the alloy steel base material toward a negligible amount in the valve seat layer.
Claim 2
Dependent Claim
116 words
An engine valve comprising: a valve head of an alloy steel base material; an annular valve seat layer of a metallic alloy material different than the alloy steel base material, the valve seat layer being fusibly bonded to the valve head by a beam of electromagnetic energy; and a region of interstitial bond between the valve head and the valve seat layer having a thickness of about 0.003" (0.075 mm), having properties derived from both the alloy steel base material and the metallic alloy material, and defining a relatively abrupt descendency of the relative concentration of iron from the amount present in the alloy steel base material toward a negligible amount in the valve seat layer.
Claim 3
Dependent Claim
28 words
The engine valve of claim 1 wherein said valve head is of austenitic chrome nickel silicon steel and said annular valve seat layer is of Stellite fused thereto.
Claim 4
Dependent Claim
30 words
The engine valve of claim 2 wherein said Stellite valve seat layer has a relatively high Rockwell hardness in the range of R c 65-67 for improved resistance to wear.
References Cited (Backward Citations)
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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) | 1983-01-07 | 1983-07-09 | 1984-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-07 | 1987-07-09 | 1988-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-07 | 1991-07-09 | 1992-01-08 | $7700.00 | Window Closed / Lapsed |