US2594876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for carburizing steel
Assignee: Electric Furnace Co
•
Filing: 1948-08-06
•
Granted: 1952-04-29
•
Expires: 1968-08-06
Abstract
No abstract record available.
Inventors
- 👤 Frank T Cope
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:47
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/56; C21D9/561; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/20; C23C8/22; C21D9/0043
Claims Analysis
Total Claims: 0
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US2441500A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |