US3856486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic pressure control system
Assignee: Sunoco Inc
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Filing: 1974-01-24
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Granted: 1974-12-24
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Expires: 1994-01-24
Abstract
Abstract The pneumatic pressure at a load is maintained constant regardless of changes in the air supply pressure and in the air flow rate through the load by feeding back the load pressure and comparing it with a setpoint in a pressure regulator which is used to control the output pressure of a volume booster used to supply the load. To increase the system stability, minor loop signal feedback is utilized upstream of the load-varying element by way of a compensation network to the control coupling for the volume booster.
Inventors
- 👤 R Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:13
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/44; G05D; G05D16/00; G05D16/02; G05D16/04; G05D16/0404; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409; Y10T137/2496; Y10T137/2559; Y10T137/2562
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
108 words
A pneumatic pressure control system for automatically controlling the pressure supplied to a load from an air supply, comprising a pressure regulator having a setpoint and arranged and connected to receive air from said air supply; a volume booster relay connected and receiving air from said air supply and supplying output air to a load, means connected to said regulator and relay for utilizing the output of said regulator to control the output pressure of said relay, and means connected adjacent said load to said regulator for feeding back a pressure signal from upstream said load to said regulator, for comparison with said setpoint to produce a signal.
Claim 2
Dependent Claim
108 words
A pneumatic pressure control system for automatically controlling the pressure supplied to a load from an air supply, comprising a pressure regulator having a setpoint and arranged and connected to receive air from said air supply; a volume booster relay connected and receiving air from said air supply and supplying output air to a load, means connected to said regulator and relay for utilizing the output of said regulator to control the output pressure of said relay, and means connected adjacent said load to said regulator for feeding back a pressure signal from upstream said load to said regulator, for comparison with said setpoint to produce a signal.
Claim 3
Dependent Claim
20 words
System according to claim 1, including also a load-varying element connected between the output of said relay and said load.
Claim 4
Dependent Claim
20 words
System defined in claim 2, wherein the load-varying element comprises a filter for the output air supplied by said relay.
Claim 5
Dependent Claim
32 words
System set forth in claim 2, including also means for feeding back a pressure signal from the upstream side of said load-varying element to the output pressure control coupling of said relay.
Claim 6
Dependent Claim
20 words
System defined in claim 4, wherein the load-varying element comprises a filter for the output air supplied by said relay.
Claim 7
Dependent Claim
33 words
System defined in claim 4, wherein the last-mentioned feedback means includes a compensation network forming a pressure divider between the output of the regulator and the output pressure control coupling of the relay.
Claim 8
Dependent Claim
40 words
System defined in claim 4, wherein the last-mentioned feedback means includes a compensation network composed of a group of flow restrictors forming a pressure divider between the output of the regulator and the output pressure control coupling of the relay.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |