Patent US3597188A successfully refreshed from Google Patents.
US3597188A
Expired / Lapsed
US
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Method of making high density iron powder
Assignee: Domtar Inc
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Filing: 1968-08-23
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Granted: 1971-08-03
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Expires: 1988-08-23
Abstract
Abstract IRON POWDER OF AN APPARENT DENSITY OF OVER 3.0 GMS./ CC. IS PRODUCED BY FIRST SHOTTING MOLTEN IRON TO OBTAIN SUBSTANTIALLY SPERICAL SHOT, SCREENING THE SHOT TO REMOVE OVERSIZE PARTICLES AS WELL AS VERY FINE PARTICLES, SINTERING THE SHOT IN THE PRESENCE OF A DECARBONIZING AGENT, GRINDING THE SINTERED MATERIAL AND AGAIN SCREENING TO REMOVE PARTICLES ABOVE A CERTAIN SIZE.
Inventors
- 👤 Nathan Neumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:15
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0235; B; B22; B22F; B22F1/00; B22F1/14; B22F1/148
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |