US2807319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil burner
Assignee: Eureka Williams Co
•
Filing: 1952-09-23
•
Granted: 1957-09-24
•
Expires: 1972-09-23
Abstract
No abstract record available.
Inventors
- 👤 Robert R Witherell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:26
CPC Classifications
F; F23; F23D; F23D11/00; F23D11/001; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2937; Y10T137/2947; Y10T137/2965
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1854749A
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US1613969A
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US1650561A
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US1921922A
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US1986003A
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US2022513A
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US2516063A
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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) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |