Patent US2853767A successfully refreshed from Google Patents.
US2853767A
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Method of making high density ferrous alloy powder compacts and products thereof
Assignee: Duracell Inc USA
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Filing: 1955-03-23
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Granted: 1958-09-30
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Expires: 1975-03-23
Abstract
No abstract record available.
Inventors
- 👤 Eugene W Burkhammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:59
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0235; C22C33/0257; C22C33/0278; Y; Y10; Y10S; Y10S75/00; Y10S75/95; Y10S75/951
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PRESSED AND SINTERED IRON BASE COMPACT CHARACTERIZED BY A DENSITY WHICH IS AT LEAST 94% OF THE THEORETICAL DENSITY, SAID COMPACT HAVING CHARACTERISTICS RESULTING FROM HEATING INDIVIDUALLY POROUS IRON POWDER PARTICLES IN AN OXIDIZING ATMOSPHERE TO PARTIALLY OXIDIZE THE SAME TO A WEIGHT GAIN BETWEEN ABOUT 11% AND ABOUT 18%, ADMIXING WITH SAID POWDER THE INGREDIENTS TO BE ALLOYED WITH THE IRON IN POWDER FORM, COMMINUTING THE RESULTING MIXTURE OF POWDERS, REDUCING THE MIXTURE OF POWDERS, PULVERTIZING THE REDUCED MIXTURE, PRESSING A COMPACT FROM SAID MIXTURE, AND SINTERING SAID COMPACT IN A PROTECTIVE ATMOSPHERE.
Claim 2
Dependent Claim
95 words
A PRESSED AND SINTERED IRON BASE COMPACT CHARACTERIZED BY A DENSITY WHICH IS AT LEAST 94% OF THE THEORETICAL DENSITY, SAID COMPACT HAVING CHARACTERISTICS RESULTING FROM HEATING INDIVIDUALLY POROUS IRON POWDER PARTICLES IN AN OXIDIZING ATMOSPHERE TO PARTIALLY OXIDIZE THE SAME TO A WEIGHT GAIN BETWEEN ABOUT 11% AND ABOUT 18%, ADMIXING WITH SAID POWDER THE INGREDIENTS TO BE ALLOYED WITH THE IRON IN POWDER FORM, COMMINUTING THE RESULTING MIXTURE OF POWDERS, REDUCING THE MIXTURE OF POWDERS, PULVERTIZING THE REDUCED MIXTURE, PRESSING A COMPACT FROM SAID MIXTURE, AND SINTERING SAID COMPACT IN A PROTECTIVE ATMOSPHERE.
References Cited (Backward Citations)
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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) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |