US2938577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for preventing backfire in gas burner systems
Assignee: Airco Inc
•
Filing: 1956-10-04
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Granted: 1960-05-31
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Expires: 1976-10-04
Abstract
No abstract record available.
Inventors
- 👤 Howard G Hughey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:42
CPC Classifications
F; F23; F23K; F23K5/00; F23K5/002; F23K5/007; F23D; F23D14/00; F23D14/46; F23D14/72; F23D14/82; F23D2209/00; F23D2209/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |