US3703183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbine speed control
Assignee: Elliott Turbomachinery Co Inc
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Filing: 1971-02-11
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Granted: 1972-11-21
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Expires: 1991-02-11
Abstract
Abstract The position of the valve controlling the supply of fluid operating a prime mover, such as a turbine, is determined by a force produced by a speed control mechanism. The level of the applied force is proportional to the speed of the prime mover. A variable force spring and a constant force spring are connected in parallel relation and conjointly opposes the force produced by the control mechanism.
Inventors
- 👤 Richard A Worthen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:44
CPC Classifications
F; F01; F01D; F01D17/00; F01D17/20; F01D17/22; F01D17/26; F01D17/10; F01D17/12; F01D17/14; F01D17/141; F01D17/145; G; G05; G05D; G05D13/00; Y; Y10; Y10T; Y10T137/00; Y10T137/0971
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A valve movable between open and closed positions for controlling the flow of fluid to a prime mover for the operation thereof, valve control means operable to produce force applied to said valve to urge the same to closed position, the magnitude of said force being in accordance with the speed of the said prime mover, a variable force spring and a constant force spring, said springs being connected to said valve in parallel relation for conjointly opposing the force produced by said control means.
Claim 2
Dependent Claim
85 words
A valve movable between open and closed positions for controlling the flow of fluid to a prime mover for the operation thereof, valve control means operable to produce force applied to said valve to urge the same to closed position, the magnitude of said force being in accordance with the speed of the said prime mover, a variable force spring and a constant force spring, said springs being connected to said valve in parallel relation for conjointly opposing the force produced by said control means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |