Patent US3668013A successfully refreshed from Google Patents.
US3668013A
Expired / Lapsed
US
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Fuel cell system with pneumatic fuel flow control
Assignee: RTX Corp
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Filing: 1969-04-21
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Granted: 1972-06-06
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Expires: 1989-04-21
Abstract
Abstract A control is disclosed for automatically metering fluid flow as a function of the difference between two pressures or of a single pressure. A restriction is disposed in the fluid outlet line so that the metered flow will depend upon pressure differential across the restriction. The pressure upstream of the restriction is regulated by a valve in the supply line activated by a computing diaphragm assembly consisting essentially of three spaced interconnected disc elements responsive to the difference between the two pressures or a single control pressure when one of the pressures is fixed.
Inventors
- 👤 Thomas C Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:39
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/04; H01M8/04082; H01M8/04089; H01M8/06; H01M8/0606; H01M8/0612; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |