Patent US30206A successfully refreshed from Google Patents.
US3729344A
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Process for making thermally hardened wrought stainless steel shaped member having a duplex ferritic/martensitic microstructure
Assignee: Carpenter Technology Corp
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Filing: 1971-03-12
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Granted: 1973-04-24
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Expires: 1991-03-12
Abstract
Abstract THERMALLY HARDENED AND STRENGTHENED MEMBERS MADE FROM STAINLESS STEEL CONTAINING 0.04-0.10% CARBON, 0.040.08% NITROGEN, UP TO 1% EACH OF MANGANESE AND SILICON, 16-17.5% CHROOMIUM, UP TO 1.0% NICKEL AND 0.75-1.5% MOLYBDENUM, WHICH RESPOND TO TEMPERING, CAN BE COLD WORKED UP TO ABOUT 50 TOO 75% REDUCTION IN AREA AND HAVE A DEPLEX MICRO-STRUCTURE OF BOOTH FERRITE AND MARTENSITE.
Inventors
- 👤 S Lukes
- 👤 R Caton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:49
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/22
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |