US3271206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Short-time heat-treating process for steels
Assignee: Yawata Iron and Steel Co Ltd
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Filing: 1963-02-26
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Granted: 1966-09-06
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Expires: 1983-02-26
Abstract
No abstract record available.
Inventors
- 👤 Goda Susumu
- 👤 Gondo Hisashi
- 👤 Hiyoshi Suehiro
- 👤 Arima Asao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:17
CPC Classifications
—
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
99 words
A HEAT TREATING PROCESS FOR STEEL COMPRISING HEATING QUICKLY A STEEL CONTAINING 0.10%C., 0.32% SI. 1.13% MN THE REST BEING FE AND THE USUAL IMPURITIES TO A TEMPERATURE OF 930*C. IN A HEATING TIME OF LESS THAN 100 SECONDS, HOLDING SAID STEEL AT SAID TEMPERATURE FOR FROM 30 SECONDS TO 2 MINUTES, QUENCHING IT SO AS TO PRODUCE A FINE GRAIN HARDENED STRUCTURE, THAN AGAIN HEATING QUICKLY SAID STEEL TO A TEMPERATURE OF FROM 600 TO 690*C. IN A HEATING TIME OF 100 SECONDS, HOLDING IT AT SAID TEMPERATURE FOR FROM 20 SECONDS TO 3 MINUTES SO THAT CARBIDE
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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) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |