Patent US1560439A successfully refreshed from Google Patents.
Patent US3704115A successfully refreshed from Google Patents.
US3704115A
Expired / Lapsed
US
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High alloy steel powders and their consolidation into homogeneous tool steel
Assignee: Hoganas AB
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Filing: 1971-02-23
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Granted: 1972-11-28
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Expires: 1991-02-23
Abstract
Abstract THE HIGH ALLOY STEEL POWDER CONTAINS ONE OR MORE ELEMENTS WITH A STRONG AFFINITY TO OXYGEN, SUCH AS TITANIUM, CHROMIUM, AND VANADIUM. THE OXYGEN CONTENT EXCEEDS 0.15%, AND THE CARBON CONTENT IS RELATED TO THE OXYGEN CONTENT AND TO THE THEORETICAL CARBON CONTENT WHICH WOULD STOICHIOMETRICALLY BE NECESSARY FOR FORMING CARBIDES ITH ALLOYING ELEMENTS. POROUS BILLETS ARE PRODUCED BY HEATING THE POWDER IN A VACUUM TO 900-1250*C. TO REDUCE THE OXYGEN CONTENT TO 0.05%.
Inventors
- 👤 Erik Goran Wastenson
- 👤 Georg Heinrich Art Bockstiegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:46
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285; C22C38/14; Y; Y10; Y10S; Y10S75/00; Y10S75/95; Y10S75/951
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |