US2920958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the powder metallurgical manufacture of chromium alloys
Assignee: Wargons AB
•
Filing: 1956-11-20
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Granted: 1960-01-12
•
Expires: 1976-11-20
Abstract
No abstract record available.
Inventors
- 👤 Bergh Sven Sigvard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:20
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0207
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
A METHOD FOR THE POWDER METALLURGICAL MANUFACTURE OF ALLOYS WHICH COMPRISES FORMING A MIXTURE THE MAJOR PART OF WHICH CONSISTS OF TWO POWDERS ONE OF WHICH IS A DUCTILE METAL POWDER AND CONSISTS ESSENTIALLY OF AT LEAST ONE OF THE METLAS OF THE GROUP CONSISTING OF IRON, COBALT AND NICKEL AND THE OTHER OF WHICH IS AN ALLOY POWDER THE STRUCTURE OF WHICH CONSISTS OF AT LEAST 25% OF AT LEAST ONE PHASE OF THE GROUP CONSISTING OF THE SIGMA, MU, XI AND CHI PHASES, SAID POWDER MIXTURE CONTAINING AT LEAST 10% OF CHROMIUM, PRESSING SAID MIXTURE TO FORM A COHERENT BODY AND HEATING SAID BODY AT A TEMPERATURE BELOW THE MELTING POINTS OF SAID TWO POWDERS BUT AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO CAUSE A DIFFUSION REACTION BETWEEN SAID POWDERS TO FORM A SUBSTANTIALLY CHEMICALLY HOMOGENEOUS ALLOY WHICH IS SUBSTANTIALLY FREE OF SAID PHASE AND TO CAUSE SINTERING TOGETHER OF SAID POWDERS, THE RATIO OF SAID DUCTILE METAL POWDER TO SAID ALLOY POWDER IN SAID MIXTURE BEING WITHIN THE RANGE FROM 2 TO 1 TO 2.
Claim 2
Independent Claim
180 words
A METHOD FOR THE POWDER METALLURGICAL MANUFACTURE OF ALLOYS WHICH COMPRISES FORMING A MIXTURE THE MAJOR PART OF WHICH CONSISTS OF TWO POWDERS ONE OF WHICH IS A DUCTILE METAL POWDER AND CONSISTS ESSENTIALLY OF AT LEAST ONE OF THE METLAS OF THE GROUP CONSISTING OF IRON, COBALT AND NICKEL AND THE OTHER OF WHICH IS AN ALLOY POWDER THE STRUCTURE OF WHICH CONSISTS OF AT LEAST 25% OF AT LEAST ONE PHASE OF THE GROUP CONSISTING OF THE SIGMA, MU, XI AND CHI PHASES, SAID POWDER MIXTURE CONTAINING AT LEAST 10% OF CHROMIUM, PRESSING SAID MIXTURE TO FORM A COHERENT BODY AND HEATING SAID BODY AT A TEMPERATURE BELOW THE MELTING POINTS OF SAID TWO POWDERS BUT AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO CAUSE A DIFFUSION REACTION BETWEEN SAID POWDERS TO FORM A SUBSTANTIALLY CHEMICALLY HOMOGENEOUS ALLOY WHICH IS SUBSTANTIALLY FREE OF SAID PHASE AND TO CAUSE SINTERING TOGETHER OF SAID POWDERS, THE RATIO OF SAID DUCTILE METAL POWDER TO SAID ALLOY POWDER IN SAID MIXTURE BEING WITHIN THE RANGE FROM 2 TO 1 TO 2.
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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) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |