US2495823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressing of articles from metal powder
Assignee: Isthmian Metals Inc
•
Filing: 1946-12-02
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Granted: 1950-01-31
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Expires: 1966-12-02
Abstract
No abstract record available.
Inventors
- 👤 Richard E Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:12
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
116 words
A METHOD OF MAKING STEEL BODIES FROM POWDERED METAL BY TWO PRESSING OPERATIONS, EACH FOLLOWED BY SINTERING IN A MANNER TO MINIMIZE DIE WEAR DURING THE REPRESSING OPERATION, SAID METHOD COMPRISING THE STEPS OF COMPRESSING A POWDER OF IRON AND CARBON TO FORM A COHERENT SUBSTANTIALLY POROUS BODY, SINTERING THE COHERENT BODY IN AN ATMOSPHERE SUBSTANTIALLY IN CARBON EQUILIBRIUM WITH THE BODY AT THE SINTERING TEMPERATURE TO FORM A STEEL BODY, FURTHER SINTERING THE BODY IN AN ATMOSPHERE OF REDUCED CARBURIZING POTENTIAL TO EFFECT REMOVAL OF SUBSTANTIALLY ALL OF THE CARBON FROM THE SURFACE REGION OF THE STEEL BODY SO THAT THE SURFACE IS CONSTITUTED BY A LAYER OF SOFT SUBSTANTIALLY CARBON-FREE IRON, REPRESSING THE BODY,
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) | 1953-01-30 | 1953-08-01 | 1954-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-30 | 1957-08-01 | 1958-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-30 | 1961-08-01 | 1962-01-31 | $7700.00 | Window Closed / Lapsed |