Patent US3425822A successfully refreshed from Google Patents.
US3425822A
Expired / Lapsed
US
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Process for producing dispersion-modified alloys of chromium and iron-group metals
Assignee: Fansteel Inc
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Filing: 1966-04-19
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Granted: 1969-02-04
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Expires: 1986-04-19
Abstract
No abstract record available.
Inventors
- 👤 John B Lambert
- 👤 John T Looby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:19
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/051; C22C1/057; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; Y; Y10; Y10S; Y10S75/00; Y10S75/956
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
IN A PROCESS FOR MAKING A METAL COMPOSITION CONTAINING 0.5 TO 40% BY WEIGHT BY CHROMIUM, IN WHICH PROCESS (1) A MIXTURE COMPRISING (A) AN OXIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF IRON, COBALT AND NICKEL, (B) A PARTICULATE REFRACTORY OXIDE HAVING A FREE ENERGY OF FORMATION AT 1000*C. GREATER THAN 103 KILOCALORIES PER GRAM ATOM OF OXYGEN AND A PARTICLE SIZE BELOW 35 MILLIMICRONS, AND (C) A CHROMIUM OXIDE, IS PREPARED AND (2) THE OXIDES (A) AND (C) ARE DEOXIDIZED BY HEATING THE MIXTURE WITH A CARBONACEOUS REDUCING AGENT UNTIL THE OXYGEN CONTENT OF THE PRODUCT IN EXCESS OF THAT COMBINED IN OXIDE (B) IS BELOW ABOUT 2000 P.P.M., THE IMPROVEMENT WHICH COMPRISES (3) DECARBURIZING THE DEOXIDIZED MIXTURE BY HEATING IT AT A TEMPERATURE OF 700 TO 1000*C. IN A FLOWING GAS STREAM CONTAINING HYDROGEN, THE PRESSURE OF HYDROGEN BEING AT LEAST TWO ATMOSPHERES, SAID DECARBURIZING BEING CONTINUED AT LEAST UNTIL SUBSTANTIALLY ALL ELEMENTAL CARBON HAS BEEN REMOVED.
Claim 2
Dependent Claim
162 words
IN A PROCESS FOR MAKING A METAL COMPOSITION CONTAINING 0.5 TO 40% BY WEIGHT BY CHROMIUM, IN WHICH PROCESS (1) A MIXTURE COMPRISING (A) AN OXIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF IRON, COBALT AND NICKEL, (B) A PARTICULATE REFRACTORY OXIDE HAVING A FREE ENERGY OF FORMATION AT 1000*C. GREATER THAN 103 KILOCALORIES PER GRAM ATOM OF OXYGEN AND A PARTICLE SIZE BELOW 35 MILLIMICRONS, AND (C) A CHROMIUM OXIDE, IS PREPARED AND (2) THE OXIDES (A) AND (C) ARE DEOXIDIZED BY HEATING THE MIXTURE WITH A CARBONACEOUS REDUCING AGENT UNTIL THE OXYGEN CONTENT OF THE PRODUCT IN EXCESS OF THAT COMBINED IN OXIDE (B) IS BELOW ABOUT 2000 P.P.M., THE IMPROVEMENT WHICH COMPRISES (3) DECARBURIZING THE DEOXIDIZED MIXTURE BY HEATING IT AT A TEMPERATURE OF 700 TO 1000*C. IN A FLOWING GAS STREAM CONTAINING HYDROGEN, THE PRESSURE OF HYDROGEN BEING AT LEAST TWO ATMOSPHERES, SAID DECARBURIZING BEING CONTINUED AT LEAST UNTIL SUBSTANTIALLY ALL ELEMENTAL CARBON HAS BEEN REMOVED.
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) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |