Patent US2930196A successfully refreshed from Google Patents.
US2930196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valved intermittent combustion reaction engine
Assignee: Calspan Corp
•
Filing: 1951-03-30
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Granted: 1960-03-29
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Expires: 1971-03-30
Abstract
No abstract record available.
Inventors
- 👤 Hertzberg Abraham
- 👤 Jr Joseph G Logan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:28
CPC Classifications
F; F02; F02K; F02K7/00; F02K7/02; F02K7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1980266A
Cited
GB424955A
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US2500712A
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US2486967A
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US2594765A
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US2515644A
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US2543758A
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US2550515A
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US2579321A
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US2659198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |