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. 07, 2002
Filed:
May. 09, 1997
David W. Birch, Bordon, GB;
André Micke, Summit, NJ (US);
Shuen-Cheng Hwang, Chester, NJ (US);
Lesli B. Cosey, West Chicago, IL (US);
Carl W. Schmidt, Downers Grove, IL (US);
Robert F. Phillips, Newtown, PA (US);
D. Bruce Wilson, Spring City, PA (US);
The BOC Group, Inc., Murray Hill, NJ (US);
Abstract
Gas mixtures having precise compositions are prepared by separately pumping the components in liquid phase through piping, vaporizing the components, blending the components and analyzing the mixture for composition. A signal sent to a control unit causes any necessary change in the rate of pumping of the liquid components to reduce the difference between the measured concentration and the desired concentration. When the composition is within desired limits it is charged into gas cylinders.