US2807542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making high density sintered alloys
Assignee: Individual
•
Filing: 1955-07-08
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Granted: 1957-09-24
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Expires: 1975-07-08
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:47
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0084
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
IN THE METHOD OD PRODUCING AN ALLOY PRODUCT OF HIGH RELATIVE DENSITY, THE STEPS OF PREPARING A MIXTURE OF APPROXIMATELY 24.7% TUNGSTEN POWDER AND APPROXIMATELY 1.0% GRAPHITE POWDER, AND OF APPROXIMATELY 74.3% OF A PRE-ALLOYED POWDER CONTAINING APPROMIMATELY 28.4% CHROMIUM AND APPROXIMATELY 71.4% COBALT; THEN PRESSING SAID MIXTURE TO FROM A COMPACT OF HIGH GREEN STRENGTH; HEATING THE SAME TO A SINTERING TEMPERATURE OF APPROXIMATELY 1265*C., MAINTAINING SAID COMPACT NEAR THAT TEMPERATURE FOR NOT LESS THAN FIFTEEN MINUTES TO EFFECT PRELIMINARY BONDING OF THE METALS IN SAID COMPACT; THEREAFTER RAISING THE TEMPERATURE OF SAID COMPACT TO APPROXIMATELY 1285*C. MAINTAINING SAID COMPACT AT APPROXIMATELY THE 1285*C. TEMPERATURE FOR ABOUT 30 TO 60 MINUTES TO PRACTICALLY COMPLETE THE ALLOYING OF THE INGREDIENTS IN SAID COMPACT WITHOUT MATERIALLY CHANGING THE PHYSICAL CONFIGURATION OF SAID COMPACT, AND COOLING SAID COMPACT TO ROOM TEMPERATURE.
Claim 2
Dependent Claim
139 words
IN THE METHOD OD PRODUCING AN ALLOY PRODUCT OF HIGH RELATIVE DENSITY, THE STEPS OF PREPARING A MIXTURE OF APPROXIMATELY 24.7% TUNGSTEN POWDER AND APPROXIMATELY 1.0% GRAPHITE POWDER, AND OF APPROXIMATELY 74.3% OF A PRE-ALLOYED POWDER CONTAINING APPROMIMATELY 28.4% CHROMIUM AND APPROXIMATELY 71.4% COBALT; THEN PRESSING SAID MIXTURE TO FROM A COMPACT OF HIGH GREEN STRENGTH; HEATING THE SAME TO A SINTERING TEMPERATURE OF APPROXIMATELY 1265*C., MAINTAINING SAID COMPACT NEAR THAT TEMPERATURE FOR NOT LESS THAN FIFTEEN MINUTES TO EFFECT PRELIMINARY BONDING OF THE METALS IN SAID COMPACT; THEREAFTER RAISING THE TEMPERATURE OF SAID COMPACT TO APPROXIMATELY 1285*C. MAINTAINING SAID COMPACT AT APPROXIMATELY THE 1285*C. TEMPERATURE FOR ABOUT 30 TO 60 MINUTES TO PRACTICALLY COMPLETE THE ALLOYING OF THE INGREDIENTS IN SAID COMPACT WITHOUT MATERIALLY CHANGING THE PHYSICAL CONFIGURATION OF SAID COMPACT, AND COOLING SAID COMPACT TO ROOM 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) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |