Patent US3100729A successfully refreshed from Google Patents.
US3100729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stainless steel product and method
Assignee: Armco Inc
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Filing: 1961-04-27
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Granted: 1963-08-13
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Expires: 1981-04-27
Abstract
No abstract record available.
Inventors
- 👤 George N Goller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:58
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
IN THE PRODUCTION OF STAINLESS STEEL OF GOOD FATIGUE RESISTANCE, THE ART WHICH COMPRISES PROVIDING STEEL NOT EXCEEDING 1/2" THICKNESS AND ESSENTIALLY CONSISTING OF ABOUT 16% TO 26% CHROMIUM, ABOUT 6% TO 22% NICKEL, CARBON UP TO ABOUT .25% MAXIMUM, WITH REMAINDER SUBSTANTIALLY ALL IRON; COLD-REDUCING THE SAME, WITHOUT BENEFIT OF INTERMEDIATE ANNEAL IN AN AMOUNT EXCEEDING ABOUT 80% AND GIVING A TENSILE STRENGTH OF ABOUT 250,000 P.S.I. OR MORE; AND THEN TEMPERING THE SAME AT A TEMPERATURE OF ABOUT 1200*F. TO 1750*F. FOR ABOUT 1/10 TO 30 MINUTES TO GIVE AN ELONGATION OF ABOUT 20% TO 40% WITH A TENSILE STRENGTH OF ABOUT 110,000 TO 140,000 P.S.I. AND FINE EQUI-AXED GRAIN STRUCTURE.
Claim 2
Dependent Claim
113 words
IN THE PRODUCTION OF STAINLESS STEEL OF GOOD FATIGUE RESISTANCE, THE ART WHICH COMPRISES PROVIDING STEEL NOT EXCEEDING 1/2" THICKNESS AND ESSENTIALLY CONSISTING OF ABOUT 16% TO 26% CHROMIUM, ABOUT 6% TO 22% NICKEL, CARBON UP TO ABOUT .25% MAXIMUM, WITH REMAINDER SUBSTANTIALLY ALL IRON; COLD-REDUCING THE SAME, WITHOUT BENEFIT OF INTERMEDIATE ANNEAL IN AN AMOUNT EXCEEDING ABOUT 80% AND GIVING A TENSILE STRENGTH OF ABOUT 250,000 P.S.I. OR MORE; AND THEN TEMPERING THE SAME AT A TEMPERATURE OF ABOUT 1200*F. TO 1750*F. FOR ABOUT 1/10 TO 30 MINUTES TO GIVE AN ELONGATION OF ABOUT 20% TO 40% WITH A TENSILE STRENGTH OF ABOUT 110,000 TO 140,000 P.S.I. AND FINE EQUI-AXED GRAIN STRUCTURE.
References Cited (Backward Citations)
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US2527521A
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US2578782A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-12 | 1967-02-11 | 1967-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-12 | 1971-02-11 | 1971-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-12 | 1975-02-11 | 1975-08-13 | $7700.00 | Window Closed / Lapsed |