Patent US3747634A successfully refreshed from Google Patents.
US3747634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo system with electrically operated valve for maintaining a constant pressure
Assignee: Optical Coating Laboratory Inc
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Filing: 1972-03-23
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Granted: 1973-07-24
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Expires: 1992-03-23
Abstract
Abstract A servo system with electrically operated valve for maintaining a constant pressure in a chamber in which the valve is mounted on the chamber to precisely control the rate of flow into the chamber and having monitoring means adapted to be mounted on the chamber for monitoring the pressure in the chamber. An error amplifier is provided for comparing the monitor pressure with the reference and supplies an error signal to the electrically operated valve to change the rate of metering of fluid into the chamber.
Inventors
- 👤 E Eufusia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:33
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0675; F16K1/00; F16K1/32; F16K1/34; F16K1/36; F16K1/38; F16K1/52; F16K31/08; G; G05; G05D; G05D16/00; G05D16/20; G05D16/2086; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7761
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
In a servo system for maintaining a constant pressure in a chamber, an electromagnetic valve assembly adapted to be mounted on said chamber for precisely controlling the rate of flow of a fluid into the chamber, monitoring means adapted to be mounted on the chamber for monitoring the pressure in the chamber and supplying an electrical output in analog form, a reference providing an electrical output in analog form, an electronic error amplifier, means connecting the output of the reference to the error amplifier, means connecting the output of of the monitoring means to the error amplifier, and electronic means connecting the output of the error amplifier to the electromagnetic valve assembly, said error amplifier comparing the output from the monitoring means with the output of the reference and supplying an analog error signal to the electromagnetic valve assembly which is used for changing the rate of metering of the fluid into the chamber.
Claim 2
Dependent Claim
154 words
In a servo system for maintaining a constant pressure in a chamber, an electromagnetic valve assembly adapted to be mounted on said chamber for precisely controlling the rate of flow of a fluid into the chamber, monitoring means adapted to be mounted on the chamber for monitoring the pressure in the chamber and supplying an electrical output in analog form, a reference providing an electrical output in analog form, an electronic error amplifier, means connecting the output of the reference to the error amplifier, means connecting the output of of the monitoring means to the error amplifier, and electronic means connecting the output of the error amplifier to the electromagnetic valve assembly, said error amplifier comparing the output from the monitoring means with the output of the reference and supplying an analog error signal to the electromagnetic valve assembly which is used for changing the rate of metering of the fluid into the chamber.
Claim 3
Dependent Claim
67 words
A system as in claim 1 wherein said valve assembly comprises a housing, a needle valve seat carried by the housing and having an opening therein, a needle valve, a coil assembly carrying the needle valve, means mounted in the housing forming a magnetic field about the coil assembly, and yieldable means retaining said needle valve in a predetermined position with respect to said needle valve seat.
Claim 4
Dependent Claim
13 words
A system as in claim 1 wherein said electronic means includes a compensator.
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |