US2690213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid fuel burner and combustion air louver
Assignee: ZF International UK Ltd
•
Filing: 1951-02-12
•
Granted: 1954-09-28
•
Expires: 1971-02-12
Abstract
No abstract record available.
Inventors
- 👤 Collinson Eric Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:16
CPC Classifications
F; F23; F23C; F23C7/00; F23C7/008; F23D; F23D1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1322999A
Cited
US1082815A
Cited
US1706316A
Cited
US1747613A
Cited
GB365048A
Cited
DE655055C
Cited
US2117270A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |