Patent US3672037A successfully refreshed from Google Patents.
US3672037A
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Nitride strengthened stainless steel composite and production thereof
Assignee: Allegheny Ludlum Corp
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Filing: 1969-02-28
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Granted: 1972-06-27
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Expires: 1989-02-28
Abstract
Abstract The application describes composite members containing a plurality of layers at least one of which is nitride strengthened stainless steel and a pressure bonding method for producing them.
Inventors
- 👤 Lynn E Kindlimann
- 👤 Alexander B Greene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:16
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/01; B32B15/011
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
21 words
A method according to claim 1 wherein said members are heated to a temperature of from about 1,800* to about 2,200*F.
Claim 2
Dependent Claim
22 words
A method according to claim 1 wherein said members are subjected to a non-oxidizing atmosphere during the application of pressure and heat.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein said nitride-strengthened, stainless steel is less than 10 mils thick.
Claim 4
Dependent Claim
52 words
A method according to claim 1 wherein said additional member consists essentially of a nitride-strengthened, stainless steel containing as a dispersoid therein particles of a metal nitride present at an interparticle spacing of less than about 10 microns and having a free energy of formation of greater than about -21, 000 cal/mole.
Claim 5
Dependent Claim
17 words
A method according to claim 1 wherein said additional member consists essentially of a precipitation hardening alloy.
Claim 6
Dependent Claim
17 words
A method according to claim 1 wherein said additional member consists essentially of a corrosion resistant alloy.
Claim 7
Dependent Claim
17 words
A method according to claim 1 wherein said additional member consists essentially of an oxidation resistant alloy.
Claim 8
Independent Claim
87 words
A method of roll pressure bonding at least two members so as to form a composite having a strength of at least 8 ksi at 2, 000* F comprising the following steps: a. providing at least two members consisting essentially of nitride-strengthened, stainless steel containing as a dispersoid therein particles of titanium nitride present at an interparticle spacing of less than about 2 microns; b. superimposing the members; and c. heating the members to a temperature in excess of 1,600*F.; and d. roll pressure bonding the members.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |