US3687654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making alloy steel powder
Assignee: AO Smith Inland Inc
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Filing: 1971-03-10
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Granted: 1972-08-29
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Expires: 1991-03-10
Abstract
Abstract AN ALLOY STEEL POWDER TO BE USED FOR POWDER METALLURGY PROCESSES. THE POWDER IS PRODUCED BY ATOMIZING A MOLTEN STREAM OF ALLOY STEEL CONTAINING UP TO 0.40% BY WEIGHT OF CARBON AND CONTAINING ONE OR MORE OF THE FOLLOWING ELEMENTS: PERCENT NICKEL 0.20 TO 3.0 MOLYBDENUM 0.2 TO 1.0 CHROMIUM 0.2 TO 1.0 THE SILICON AND MANGANESE CONTENTS OF THE STEEL SHOULD BE LESS THAN 0.10% AND .50% BY WEIGHT RESPECTIVELY. FOLLOWING THE ATOMIZATION, THE RESULTANT PARTICLES ARE HEAT TREATED AT A TEMPERATURE OF 1500-2100*F. TO SOFTEN THE STEEL AS WELL AS REDUCING THE CARBON CONTENT. AFTER ANNEALING, THE CAKE-LIKE STRUCTURE IS BROKEN UP BY HAMMER-MILLING TO RESTORE THE AS-ATOMIZED PARTICLE SIZE.
Inventors
- 👤 Robert A Huseby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:16
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264; Y; Y10; Y10S; Y10S75/00; Y10S75/95
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |