Patent US2981321A successfully refreshed from Google Patents.
US2981321A
Expired / Lapsed
US
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Means limiting the rate of change of fuel flow to gas turbines
Assignee: ZF International UK Ltd
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Filing: 1954-02-08
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Granted: 1961-04-25
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Expires: 1974-02-08
Abstract
No abstract record available.
Inventors
- 👤 Frank G Freeman
- 👤 Eugene H Warne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:31
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2414322A
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US2581275A
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US2590853A
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US2599507A
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US2619163A
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US2605709A
Cited
US2638742A
Cited
US2703961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |