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:
Apr. 03, 1990
Filed:
Apr. 03, 1989
Randall J Vavra, Orange, CA (US);
Unit Instruments, Inc., Orange, CA (US);
Abstract
Gas flow control apparatus for controlling the flow of a process gas through a conduit system to a process site, for halting the flow of gas when the process is completed, and for then developing a partial vacuum in the conduit system sufficiently high to reduce the concentration of process gas and maintain it in a gaseous state. The partial vacuum is developed by carrier gas flowing through a venturi in communication with the conduit system supplying the process gas. The carrier gas also expels any remnants of the process gas from all points between the venturi and the process site. Further, the system can be used for vaporizing gases from liquids for use in an atmospheric process at the process site, the carrier gas flowing through the venturi and vaporizing a liquid in a chamber upstream of the venturi. The vaporized gases can then be regulated by a mass flow controller.