US2037149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible regenerative furnace
Assignee: Individual
•
Filing: 1934-11-21
•
Granted: 1936-04-14
•
Expires: 1954-11-21
Abstract
No abstract record available.
Inventors
- 👤 Reiner Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:25
CPC Classifications
F; F28; F28D; F28D17/00; F28D17/04; F23; F23L; F23L15/00; F23L15/02; F27; F27B; F27B3/00; Y; Y02; Y02E; Y02E20/00; Y02E20/34
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) | 1939-04-14 | 1939-10-14 | 1940-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-04-14 | 1943-10-14 | 1944-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-04-14 | 1947-10-14 | 1948-04-14 | $7700.00 | Window Closed / Lapsed |