US2515644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating valve for multiple resonance combustion chambers
Assignee: DANIEL AND FLORENCE GUGGENHEIM
•
Filing: 1947-03-11
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Granted: 1950-07-18
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Expires: 1967-03-11
Abstract
No abstract record available.
Inventors
- 👤 Esther C Goddard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:21
CPC Classifications
F; F02; F02K; F02K7/00; F02K7/02; F02K7/06; Y; Y10; Y10S; Y10S60/00; Y10S60/915
Claims Analysis
Total Claims: 0
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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) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |