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:
Oct. 24, 1989
Filed:
Sep. 19, 1988
Applicant:
Inventors:
Benjamin Y Liu, North Oaks, MN (US);
James W Ramsey, Golden Valley, MN (US);
Assignee:
Regents of the University of Minnesota, Minneapolis, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F17C / ;
U.S. Cl.
CPC ...
62 502 ; 62 521 ;
Abstract
A flow visualization system usable for clean rooms to determine the flow conditions that exist during manufacture, includes a frame mounting a source of steam and a liquid cryogen container. Steam is passed over an interface with the cryogenic material providing a highly visible fog that is neutrally buoyant and non-contaminating. The liquid cryogen level in the container is controlled by a float valve system which controls flow from a liquid cryogen tank.