US3139359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing high strength thin steel
Assignee: Jones and Laughlin Steel Corp
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Filing: 1961-06-12
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Granted: 1964-06-30
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Expires: 1981-06-12
Abstract
No abstract record available.
Inventors
- 👤 Eric R Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:27
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D8/00; C21D8/02; C21D8/0221; C21D8/0236; C22; C22C; C22C38/00; C22C38/001; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/24; C23C8/26; C21D8/0247; C21D8/0257; C21D8/0268
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
THE METHOD OF PRODUCING THIN CARBON STEEL OF HIGH TENSILE STRENGHT AND SUBSTANTIAL DEFORMABILITY COMPRISING COLD REDUCING CARBON STEEL CONTAINING UP TO ABOUT .14% CARBON TO AN INTERMEDIATE GAUGE, ANNEALING THE COLD REDUCED STEEL IN A NITRIDING ATMSOPHERE SO AS TO NITRIDE THE STEEL TO AT LEAST ABOUT .010% UNCOMBINED NITROGEN CONTENT, AND THEN COLD REDUCING THE ANNEALED INTERMEDIATE GAUGE STEEL IN AMOUNT NOT MORE THAN ABOUT 15% TO THE DESIRED GAUGE.
References Cited (Backward Citations)
US2361434A
Cited
GB618645A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |