Patent US3285789A successfully refreshed from Google Patents.
US3285789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of softening steel
Assignee: United States Steel Corp
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Filing: 1963-06-12
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Granted: 1966-11-15
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Expires: 1983-06-12
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Grange
- 👤 James B Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:58
CPC Classifications
C; C21; C21D; C21D8/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
63 words
A METHOD OF PRODUCING SPHEROIDIZE ANNEALED STEEL COMPRISING HOT ROLLING STEEL TO AT LEAST ABOUT 25% ABOVE THE FINAL GUAGE DESIRED, COOLING TO ROOM TEMPERATURE, REHEATING SAID STEEL AT A TEMPERATURE WITHIN THE RANGE OF THE AREA ABCD OF FIGURE 5 FOR THE INDICATED CARBON CONTENT, REDUCING THE THICKNESS OF SAID STEEL SUFFICIENTLY TO DEFORM THE CENTER GRAINS THEREOF WHILE AT SAID TEMPERATURE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |