The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 1990
Filed:
Mar. 28, 1988
James H Doyle, Orange, CA (US);
Unit Instruments, Inc., Orange, CA (US);
Abstract
A fast response control circuit for providing an output signal in miminum time after receiving an enabling input signal. The control circuit includes an amplifier which provides an output signal having a magnitude determined by a variable input signal when the enabling input signal indicates that an output signal is desired. A feedback network and the amplifier together define a control loop which has a characteristic response time. When the enable signal is absent, a bias control biases a reactive component in the control loop so as to minimize this response time. The circuit is adapted for use in a fluid mass flow controller to provide rapid response to an enabling input signal, particularly when a very low fluid flow rate is desired.