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. 28, 1998
Filed:
Sep. 06, 1996
Applicant:
Inventors:
John M Fay, Warrington, PA (US);
Donald S Finan, Palos Park, IL (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F26B / ;
U.S. Cl.
CPC ...
34287 ; 34538 ; 34570 ; 34 92 ; 34527 ; 34417 ;
Abstract
Control of temperature of the shelves in a freeze dryer compartment is achieved by circulating a cooled heat transfer fluid from a heat exchanger through a vacuum condenser independently of circulating the cooled heat transfer fluid either directly through the passageway chambers in the freeze dryer shelves, for cooling the shelves, or through a heater for heating the shelves. These circulations are effected by the selective control of electrically operated valves in fluid conduits automatically by a programmed computer.