US2336538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burner control for reversing furnaces
Assignee: National Tube Co
•
Filing: 1940-09-03
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Granted: 1943-12-14
•
Expires: 1960-09-03
Abstract
No abstract record available.
Inventors
- 👤 Claude J Geisel
- 👤 Peer D Nielsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:18
CPC Classifications
F; F23; F23G; F23G7/00; F23G7/04; F23G7/06
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) | 1946-12-13 | 1947-06-14 | 1947-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-12-13 | 1951-06-14 | 1951-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-12-13 | 1955-06-14 | 1955-12-14 | $7700.00 | Window Closed / Lapsed |