US3316129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallurgical conditioning process for precipitation-hardening stainless steels
Assignee: General Dynamics Corp
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Filing: 1964-01-07
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Granted: 1967-04-25
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Expires: 1984-01-07
Abstract
No abstract record available.
Inventors
- 👤 William A Token
- 👤 John J Heldt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:59
CPC Classifications
C; C21; C21D; C21D6/00; C21D6/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
AN IMPROVED METALLURGICAL CONDITIONING PROCESS FOR TREATING SEMIAUSTENITIC, PRECIPITATION HARDENING, STAINLESS STEEL TO PRODUCE A SUBSTANTIALLY MORE DUCTILE ALLOY WHILE RETAINING STATE-OF-THE-ART TENSILE STRENGTHS AND OTHER DESIRABLE METALLURGICAL CHARACTERISTIC, WHICH PROCESS CONSISTS IN THE STEPS OF: EXPOSING OBJECT WORKPIECE TO A TEMPERATURE OF FROM ABOUT 1400*F. TO ABOUT 1700*F. FOR NOT LESS THAN ABOUT TWO (2) MINUTES AND NOT MORE THAN ABOUT FIFTEEN (15) MINUTES; THEN DECREASING SAID TEMPERATURE TO NOT MORE THAN ABOUT 80*F. AND NOT LESS THAN ABOUT 60*F AND RETAINING AT THIS TEMPERATURE FOR AT LEAST ABOUT SIX (6) HOURS; THEN INCREASING SAID TEMPERATURE TO NOT MORE THAN ABOUT 1200*F. AND NOT LESS THAN ABOUT 1000*F. FOR AT LEAST ABOUT FIFTEEN (15) MINUTES; THEN
Claim 2
Dependent Claim
117 words
AN IMPROVED METALLURGICAL CONDITIONING PROCESS FOR TREATING SEMIAUSTENITIC, PRECIPITATION HARDENING, STAINLESS STEEL TO PRODUCE A SUBSTANTIALLY MORE DUCTILE ALLOY WHILE RETAINING STATE-OF-THE-ART TENSILE STRENGTHS AND OTHER DESIRABLE METALLURGICAL CHARACTERISTIC, WHICH PROCESS CONSISTS IN THE STEPS OF: EXPOSING OBJECT WORKPIECE TO A TEMPERATURE OF FROM ABOUT 1400*F. TO ABOUT 1700*F. FOR NOT LESS THAN ABOUT TWO (2) MINUTES AND NOT MORE THAN ABOUT FIFTEEN (15) MINUTES; THEN DECREASING SAID TEMPERATURE TO NOT MORE THAN ABOUT 80*F. AND NOT LESS THAN ABOUT 60*F AND RETAINING AT THIS TEMPERATURE FOR AT LEAST ABOUT SIX (6) HOURS; THEN INCREASING SAID TEMPERATURE TO NOT MORE THAN ABOUT 1200*F. AND NOT LESS THAN ABOUT 1000*F. FOR AT LEAST ABOUT FIFTEEN (15) MINUTES; THEN
References Cited (Backward Citations)
US3123468A
Cited
US2519406A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |