Patent US2277211A successfully refreshed from Google Patents.
US2277211A
Expired / Lapsed
US
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Method of producing low carbon chromium-containing iron alloys
Assignee: Individual
•
Filing: 1940-10-11
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Granted: 1942-03-24
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Expires: 1960-10-11
Abstract
No abstract record available.
Inventors
- 👤 Hugh S Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:33
CPC Classifications
C; C21; C21D; C21D3/00; C21D3/02; C21D3/04; B; B22; B22F; B22F1/00; B22F1/14; B22F1/145; C22; C22C; C22C33/00; C22C33/02; C22C33/0207
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) | 1945-03-23 | 1945-09-22 | 1946-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-03-23 | 1949-09-22 | 1950-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-03-23 | 1953-09-22 | 1954-03-24 | $7700.00 | Window Closed / Lapsed |