Patent US2940251A successfully refreshed from Google Patents.
US2940251A
Expired / Lapsed
US
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Control of pressure in rocket motors
Assignee: Phillips Petroleum Co
•
Filing: 1954-09-17
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Granted: 1960-06-14
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Expires: 1974-09-17
Abstract
No abstract record available.
Inventors
- 👤 Spencer S Prentiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:39
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/34; F02K9/80; F02K9/86
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2644663A
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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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |