US2047445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing and maintaining combustion of fluid fuel
Assignee: Individual
•
Filing: 1933-04-21
•
Granted: 1936-07-14
•
Expires: 1953-04-21
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Stephens
- 👤 Freund Helmut Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:01
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/08; F23N2239/00; F23N2239/06
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) | 1939-07-14 | 1940-01-13 | 1940-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-07-14 | 1944-01-13 | 1944-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-07-14 | 1948-01-13 | 1948-07-14 | $7700.00 | Window Closed / Lapsed |