Patent US2109840A successfully refreshed from Google Patents.
US2980171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas and oil burner
Assignee: Selas Corp of America
•
Filing: 1949-04-16
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Granted: 1961-04-18
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Expires: 1969-04-16
Abstract
No abstract record available.
Inventors
- 👤 Alfons A Furczyk
- 👤 James B Henwood
- 👤 Frederick S Bloom
- 👤 James E Hovis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:41
CPC Classifications
F; F23; F23D; F23D17/00; F23D17/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1337328A
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US1516408A
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US1851745A
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US1860942A
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US2011283A
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US2053003A
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US2004317A
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US2215079A
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US2217975A
Cited
US2452543A
Cited
US2408282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |