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US2448753A
Expired / Lapsed
US
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Heat-treating and cold-rolling hadfield manganese steel
Assignee: Sharon Steel Corp
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Filing: 1943-12-16
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Granted: 1948-09-07
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Expires: 1963-12-16
Abstract
No abstract record available.
Inventors
- 👤 Carl W Weesner
- 👤 Wallace B Leffingwell
- 👤 Elvan R Babylon
- 👤 Homer L Schell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:18
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US938893A
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US1344392A
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US1017904A
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US1462460A
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US1851903A
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US1929356A
Cited
US2368955A
Cited
US2378991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-07 | 1952-03-08 | 1952-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-07 | 1956-03-08 | 1956-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-07 | 1960-03-08 | 1960-09-07 | $7700.00 | Window Closed / Lapsed |