US4711665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation resistant alloy
Assignee: RESEARCH Corp TECHNOLOGIES Inc A NOT-FOR-PROFIT NON-STOCK CORP OF DE
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Filing: 1985-07-26
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Granted: 1987-12-08
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Expires: 2005-07-26
Abstract
Abstract An oxidation resistant alloy comprising about 3 to 14 percent Cr by weight, about 3 to 50 percent by volume Si 3 N 4 , and the balance selected from the group consisting of Fe, Ni, Co and alloys of these metals. Preferably, the Cr content is between 8 to 12 percent by weight, the Si 3 N 4 content is between about 3 to 22 percent by volume, and the alloy further includes between 1 to 2 percent Si by weight and between about 0.05 and 0.2 percent by weight of a reactive element.
Inventors
- 👤 George Simkovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:34
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0047; C22C32/0068; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/937
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
An oxidation resistant alloy consisting essentially of: about 8 to 12 percent Cr by weight; about 3 to 20 percent Si 3 N 4 by volume; about 1 to 2 percent Si by weight; up to about 0.2 percent by weight of a reactive element selected from the group consisting of Y, Sc, Th, La, and other rare Earth elements; and the balance selected from the group consisting of Fe, Ni, Co, a Fe-based alloy, a Ni-based alloy and a Co-based alloy.
Claim 2
Dependent Claim
82 words
An oxidation resistant alloy consisting essentially of: about 8 to 12 percent Cr by weight; about 3 to 20 percent Si 3 N 4 by volume; about 1 to 2 percent Si by weight; up to about 0.2 percent by weight of a reactive element selected from the group consisting of Y, Sc, Th, La, and other rare Earth elements; and the balance selected from the group consisting of Fe, Ni, Co, a Fe-based alloy, a Ni-based alloy and a Co-based alloy.
Claim 3
Dependent Claim
21 words
An alloy according to claim 1 wherein the Si 3 N 4 content is about 8 to 12 percent by volume.
Claim 4
Dependent Claim
33 words
An alloy according to claim 1 wherein: the Cr content is between 10 to 12 percent by weight; and the Si 3 N 4 content is between 8 to 12 percent by volume.
Claim 5
Dependent Claim
27 words
An oxidation resistant alloy according to claim 1, wherein the Si 3 N 4 consists of powder particles of Si 3 N 4 dispersed throughout the alloy.
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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) | 1990-12-07 | 1991-06-08 | 1991-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-07 | 1995-06-08 | 1995-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-07 | 1999-06-08 | 1999-12-08 | $7700.00 | Window Closed / Lapsed |