US2280283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deep-hardening boron steels
Assignee: ELECTRO METALLURG CO
•
Filing: 1940-01-05
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Granted: 1942-04-21
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Expires: 1960-01-05
Abstract
No abstract record available.
Inventors
- 👤 Crafts Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:26
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/02; C21; C21C; C21C7/00; C22C38/06; C22C38/12
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) | 1945-04-20 | 1945-10-20 | 1946-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-04-20 | 1949-10-20 | 1950-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-04-20 | 1953-10-20 | 1954-04-21 | $7700.00 | Window Closed / Lapsed |