Patent US2138239A successfully refreshed from Google Patents.
US2692015A
Expired / Lapsed
US
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Air guide for oil burners
Assignee: Preferred Utilities Manufacturing Corp
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Filing: 1952-02-21
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Granted: 1954-10-19
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Expires: 1972-02-21
Abstract
No abstract record available.
Inventors
- 👤 Bowman K Breed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:13
CPC Classifications
F; F23; F23D; F23D11/00; F23D11/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2108621A
Cited
US2165191A
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US2314572A
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US2351516A
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US2280638A
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US2522131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-18 | 1958-04-19 | 1958-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-18 | 1962-04-19 | 1962-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-18 | 1966-04-19 | 1966-10-19 | $7700.00 | Window Closed / Lapsed |