US2420981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel oil burner
Assignee: Individual
•
Filing: 1945-03-26
•
Granted: 1947-05-20
•
Expires: 1965-03-26
Abstract
No abstract record available.
Inventors
- 👤 Rivers Thomas De Witt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:27
CPC Classifications
F; F23; F23D; F23D5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR747483A
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US2128155A
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US2261814A
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US2367460A
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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) | 1950-05-19 | 1950-11-18 | 1951-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-19 | 1954-11-18 | 1955-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-19 | 1958-11-18 | 1959-05-20 | $7700.00 | Window Closed / Lapsed |