Gas flow controller
Patent 5329966 Issued on July 19, 1994. Estimated Expiration Date: 
March 8, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 8, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2067229 2565560 3576193 3672400 3856042 3921660 Method and apparatus for delivering constant water flow rates to a fire hose at each of a plurality of selectable flow rate settings Flow controller-flow sensor assembly for gas chromatographs and the like Automatic controlling valve for maintaining the rate of fluid flow at a constant value Electronically controlled valve actuator InventorsAssigneeApplicationNo. 027383 filed on 03/08/1993US Classes:137/613, Flow path with serial valves and/or closures137/501, Pressures across fixed choke137/614.19Biased valve with external operatorExaminersPrimary: Schwadron, Martin P.Assistant: Lee, Kevin Attorney, Agent or FirmInternational ClassesF16K 031/365F16K 031/04 AbstractThere is disclosed a system for delivering gas at a predetermined rate of flow, including a diaphgram type flow controller, a pressure regulator for providing a constant flow of gas to the flow controller, and a microprocessor controlled stepper motor utilizing an optical encoder to adjust the rate of flow of a gas leaving the controller without having to use a gas flow measurement device to monitor the flow rate. | |
