US3732092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treatment of iron powder
Assignee: Bethlehem Steel Corp
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Filing: 1972-03-31
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Granted: 1973-05-08
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Expires: 1992-03-31
Abstract
Abstract RAW IRON POWDERS ARE BLENDED SO THAT THE ATOMIC RATIO OF THE REDUCIBLE OXYGEN TO THE CARBON CONTENT OF THE BLEND IS WITHIN THE RANGE OF 1.2 TO 1.6. THE RAW POWDER BLEND IS HEAT TREATED IN A FURANCE, WITHOUT AN AUXILIARY ATMOSPHERE, TO REDUCE THE CARBON AND REDUCIBLE OXYGEN CONTENTS OF THE POWDER.
Inventors
- 👤 G Wieland
- 👤 E Rudzki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:48
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0235; B; B22; B22F; B22F1/00
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |