Patent US2721138A successfully refreshed from Google Patents.
US2721138A
Expired / Lapsed
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Method of ductilizing molybdenum and alloys thereof
Assignee: Westinghouse Electric Corp
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Filing: 1951-09-14
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Granted: 1955-10-18
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Expires: 1971-09-14
Abstract
No abstract record available.
Inventors
- 👤 Robert F Baker
- 👤 Edgar S Byron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:26
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/12; B22F3/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
THE METHOD OF MANUFACTURING DUCTILE METAL FROM AN ARTICLE OF POWDERED PARTICLES OF THE GROUP CONSISTING OF MOLYBDENUM AND ALLOYS THEREOF WITH PROPORTIONS OF METAL SELECTED FROM THE GROUP CONSISTING OF COBALT, NICKEL AND IRON UP TO 1/2%, AND TUNGSTEN UP TO 20%, PRESSED AND SINTERED, COMPRISING WORKING SAID ARTICLE AT A TEMPERATURE FROM NEAR BUT NOT HIGHER THANT 1200* C. TO 1500* C., HEATING IN A PROTECTIVE ATMOSPHERE TO A STRESS-RELIEVING TEMPERATURE BETWEEN ABOUT 1070*C. AND 975* C. FOR FROM 1 TO 60 MINUTES WITHIN THE LIMITS OF A TIME-TEMPERATURE RELATIONSHIP AS SHOWN IN FIG. 3 OF THE DRAWING ACCOMPANYING THE SPECIFICATION AND CONSTITUTING THE AREA BELOW THE UPPER CURVE REPRESENTING DROP IN ULTIMATE STRENGTH AND ABOVE THE MIDDLE CURVE REPRESENTING A LONGITUDINAL AND TRANSVERSE ELONGATION OF AT LEAST 20%, TO GET HARD, STRONG AND DUCTILE MATERIAL BY STRESS-RELIEF, WITHOUT ALLOWING THE GRAINS TO BECOME EQUIAXED BY RECRYSTALLIZATION, AND THEN COOLING THE ARTICLE AT A RATE BETWEEN 60* C. AND 120* C. PER HOUR TO A RELATIVELY LOW-TEMPERATURE.
Claim 2
Independent Claim
169 words
THE METHOD OF MANUFACTURING DUCTILE METAL FROM AN ARTICLE OF POWDERED PARTICLES OF THE GROUP CONSISTING OF MOLYBDENUM AND ALLOYS THEREOF WITH PROPORTIONS OF METAL SELECTED FROM THE GROUP CONSISTING OF COBALT, NICKEL AND IRON UP TO 1/2%, AND TUNGSTEN UP TO 20%, PRESSED AND SINTERED, COMPRISING WORKING SAID ARTICLE AT A TEMPERATURE FROM NEAR BUT NOT HIGHER THANT 1200* C. TO 1500* C., HEATING IN A PROTECTIVE ATMOSPHERE TO A STRESS-RELIEVING TEMPERATURE BETWEEN ABOUT 1070*C. AND 975* C. FOR FROM 1 TO 60 MINUTES WITHIN THE LIMITS OF A TIME-TEMPERATURE RELATIONSHIP AS SHOWN IN FIG. 3 OF THE DRAWING ACCOMPANYING THE SPECIFICATION AND CONSTITUTING THE AREA BELOW THE UPPER CURVE REPRESENTING DROP IN ULTIMATE STRENGTH AND ABOVE THE MIDDLE CURVE REPRESENTING A LONGITUDINAL AND TRANSVERSE ELONGATION OF AT LEAST 20%, TO GET HARD, STRONG AND DUCTILE MATERIAL BY STRESS-RELIEF, WITHOUT ALLOWING THE GRAINS TO BECOME EQUIAXED BY RECRYSTALLIZATION, AND THEN COOLING THE ARTICLE AT A RATE BETWEEN 60* C. AND 120* C. PER HOUR TO A RELATIVELY LOW-TEMPERATURE.
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) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |