US2636725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame hardening apparatus
Assignee: Individual
•
Filing: 1947-10-06
•
Granted: 1953-04-28
•
Expires: 1967-10-06
Abstract
No abstract record available.
Inventors
- 👤 Manley R Nelson
- 👤 Richard S Shechan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:02
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/06; C21D1/08; Y; Y10; Y10T; Y10T279/00; Y10T279/19; Y10T279/1953; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19293; Y10T74/19298; Y10T74/19307; Y10T82/00; Y10T82/27
Claims Analysis
Total Claims: 0
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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) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |