Patent US2937498A successfully refreshed from Google Patents.
US2937498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanically controlled multistage combustion chambers for gas-impulsetype engines and improved discharge control therefor
Assignee: Individual
•
Filing: 1954-01-13
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Granted: 1960-05-24
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Expires: 1974-01-13
Abstract
No abstract record available.
Inventors
- 👤 Fritz A F Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:18
CPC Classifications
F; F02; F02C; F02C5/00; F02C5/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE384532C
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US1129544A
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FR22493E
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DE387166C
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AT97359B
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GB416030A
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GB452297A
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US2195025A
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CH215484A
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US2369795A
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US2517822A
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US2750147A
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US2659198A
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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) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |