US2931430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination oil and gas burner
Assignee: Babcock and Wilcox Co
•
Filing: 1957-02-21
•
Granted: 1960-04-05
•
Expires: 1977-02-21
Abstract
No abstract record available.
Inventors
- 👤 David M Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:32
CPC Classifications
F; F23; F23D; F23D17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US837571A
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US1383741A
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US2124940A
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GB531166A
Cited
US2274818A
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US2395276A
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US2826249A
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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) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |