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. 08, 1991
Filed:
Jul. 13, 1990
Applicant:
Inventor:
David J Klee, Emmaus, PA (US);
Assignee:
Air Products and Chemicals, Inc., Allentown, PA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
F25D / ;
U.S. Cl.
CPC ...
62 63 ; 62216 ; 62374 ; 62380 ;
Abstract
Method and apparatus for controlling the cooldown and steady-state operation of a tunnel type cryogenic freezer by providing auxiliary cryogen to one or more gas recirculating zones of the freezer and controlling the supply of the auxiliary cryogen by sensing the temperature of the gas recirculating zone and comparing the temperature to a pre-set level.