US2569877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermostatically controlled vaporizing fuel burner
Assignee: VARIFLAME CORP
•
Filing: 1949-04-05
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Granted: 1951-10-02
•
Expires: 1969-04-05
Abstract
No abstract record available.
Inventors
- 👤 Henry S Woodruff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:02
CPC Classifications
F; F23; F23D; F23D5/00; F23D5/02; F23D5/04; F23N; F23N5/00; F23N5/20; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20396; Y10T74/20402
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US572255A
Cited
GB190929937A
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US1437664A
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US1425519A
Cited
US1345652A
Cited
US1883735A
Cited
US1842368A
Cited
US2104587A
Cited
US2245834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |