US3117897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for hardening steel steet and strips by over-aging
Assignee: British Iron and Steel Research Association BISRA
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Filing: 1962-09-24
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Granted: 1964-01-14
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Expires: 1982-09-24
Abstract
No abstract record available.
Inventors
- 👤 Williams Ernest Wynne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:24
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/0247; C21D8/0273; C21D1/00; C21D1/18; C21D1/19; C21D1/20; C21D9/00; C21D9/46; C21D9/52; C21D8/0221; C21D8/0236
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A PROCESS FOR THE PRODUCTION OF ANNEALED STEEL SHEET AND STRIP, WHICH COMPRISES THE STEPS OF HEATING COLD WORKED STEEL SHEET OR STRIP WHICH CONTAINS FROM 0.07 TO 0.14% CARBON AND LESS THAN 0.02% PHOSPHORUS TO A TEMPERATURE OF FROM 740* TO 850*C., RAPIDLY QUENCHING THE STEEL FROM THIS TEMPERATURE TO A TEMPERATURE OF FROM 150* TO 250*C., AND THEN OVER-AGING THE STEEL WITHIN THE LATTER TEMPERATURE RANGE UNTIL A STABLE PRODUCT HAVING A HARDNESS OF AT LEAST 65 R30T UNITS IS OBTAINED.
Claim 2
Dependent Claim
83 words
A PROCESS FOR THE PRODUCTION OF ANNEALED STEEL SHEET AND STRIP, WHICH COMPRISES THE STEPS OF HEATING COLD WORKED STEEL SHEET OR STRIP WHICH CONTAINS FROM 0.07 TO 0.14% CARBON AND LESS THAN 0.02% PHOSPHORUS TO A TEMPERATURE OF FROM 740* TO 850*C., RAPIDLY QUENCHING THE STEEL FROM THIS TEMPERATURE TO A TEMPERATURE OF FROM 150* TO 250*C., AND THEN OVER-AGING THE STEEL WITHIN THE LATTER TEMPERATURE RANGE UNTIL A STABLE PRODUCT HAVING A HARDNESS OF AT LEAST 65 R30T UNITS IS OBTAINED.
References Cited (Backward Citations)
US2387919A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-13 | 1967-07-15 | 1968-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-13 | 1971-07-15 | 1972-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-13 | 1975-07-15 | 1976-01-14 | $7700.00 | Window Closed / Lapsed |