Patent US3390522A successfully refreshed from Google Patents.
US3390522A
Expired / Lapsed
US
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Fuel systems for gas turbine engines operating at variable pressure
Assignee: Plessey Overseas Ltd
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Filing: 1966-11-16
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Granted: 1968-07-02
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Expires: 1986-11-16
Abstract
No abstract record available.
Inventors
- 👤 John P Whitehead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:04
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/22; F02C7/26; F02C9/00; F02C9/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |