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. 25, 1989
Filed:
Dec. 21, 1987
Clarence W Carpenter, Houston, TX (US);
Coleman Wood, Houston, TX (US);
Other;
Abstract
A precision gas metering apparatus is disclosed and comprises facing duplicate cylinders each having a piston therein, wherein the two cylinders are aligned with one another so that a common non-rotating shaft moves pistons in each. The shaft is driven by a stepping motor having a traveling nut connected to said shaft to impart rotation from the motor which is converted into linear movement of the shaft. With suitable valves and a pressure transducer, gas to be measured is delivered first to one volume and then to the other, the pistons being driven to equalize in flowing gas pressure to atmospheric pressure level, and thereafter summing the total volumetric filling by summing each filling of each chamber, and also summing any partial fillings. A pressure transducer assures that the filled chambers are held to a specified volume.