Patent US2181693A successfully refreshed from Google Patents.
US2181693A
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Steel treatment
Assignee: Bethlehem Steel Corp
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Filing: 1937-09-08
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Granted: 1939-11-28
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Expires: 1957-09-08
Abstract
No abstract record available.
Inventors
- 👤 Epstein Samuel
- 👤 Hugo C Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:32
CPC Classifications
B; B22; B22D; B22D7/00; C; C21; C21C; C21C7/00; C21C7/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-11-27 | 1943-05-29 | 1943-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-11-27 | 1947-05-29 | 1947-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-11-27 | 1951-05-29 | 1951-11-28 | $7700.00 | Window Closed / Lapsed |