Patent US1742787A successfully refreshed from Google Patents.
US2958618A
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US
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Method for hardening chromiumnickel stainless steel
Assignee: Armco Inc
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Filing: 1957-07-31
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Granted: 1960-11-01
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Expires: 1977-07-31
Abstract
No abstract record available.
Inventors
- 👤 Paul M Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:42
CPC Classifications
C; C21; C21D; C21D6/00; C21D6/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN THE PRODUCTION OF HEAT-HARDENED CHROMIUMNICKEL STAINLESS STEEL PRODUCTS, THE ART WHICH COMPRISES ANNEALING A HEAT-HARDENABLE CHROMIUM-NICKEL STAINLESS STEEL AT A TEMPERATURE OF 1900* TO 2050*F., FORMING THE STEEL INTO PRODUCTS OF DESIRED CONFIGURATION, CONDITIONING THE SAME AT A TEMPERATURE OF 1000* TO 1200*F. FOR PERIODS OF TIME RANGING FROM ABOUT 3 MINUTES AT THE 1200* F. TEMPERATURE UP TO ABOUT 48 HOURS AT THE TEMPERATURE OF 1000*F., REFRIGERATING THE PRODUCTS AT A TEMPERTURE OF ABOUT -30* TO -150*F, AND REHEATING THE PRODUCTS AT A TEMPERATURE OF ABOUT 700* TO 1150*F. TO HARDEN THE SAME.
Claim 2
Dependent Claim
95 words
IN THE PRODUCTION OF HEAT-HARDENED CHROMIUMNICKEL STAINLESS STEEL PRODUCTS, THE ART WHICH COMPRISES ANNEALING A HEAT-HARDENABLE CHROMIUM-NICKEL STAINLESS STEEL AT A TEMPERATURE OF 1900* TO 2050*F., FORMING THE STEEL INTO PRODUCTS OF DESIRED CONFIGURATION, CONDITIONING THE SAME AT A TEMPERATURE OF 1000* TO 1200*F. FOR PERIODS OF TIME RANGING FROM ABOUT 3 MINUTES AT THE 1200* F. TEMPERATURE UP TO ABOUT 48 HOURS AT THE TEMPERATURE OF 1000*F., REFRIGERATING THE PRODUCTS AT A TEMPERTURE OF ABOUT -30* TO -150*F, AND REHEATING THE PRODUCTS AT A TEMPERATURE OF ABOUT 700* TO 1150*F. TO HARDEN THE SAME.
References Cited (Backward Citations)
US2506558A
Cited
US2799602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-01 | 1964-05-02 | 1964-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-01 | 1968-05-02 | 1968-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-01 | 1972-05-02 | 1972-11-01 | $7700.00 | Window Closed / Lapsed |