FREEZE DRYING WITH REDUCED CRYOGEN CONSUMPTION
(12) Patent: (11) CA 2282866
ABSTRACT:
A method and apparatus for controlling the temperature of a freeze drying chamber shelves and chamber in a refrigeration system having a condenser operatively associated therewith using the circulation of a cryogen through the condenser and of a cryogenically cooled heat transfer fluid through the chamber shelves for controlling the temperature therein, and also where the temperature of the cryogenically cooled heat transfer fluid having been regulated by an exchange of heat with the cryogen.
(72) Inventors (Country): FINAN, DONALD STUART SR. (United States)
CHENG, ALAN TAT YAN (United States)
(73) Owners (Country): PRAXAIR TECHNOLOGY, INC. (United States)
(71) Applicants (Country): PRAXAIR TECHNOLOGY, INC. (United States)
(74) Agent: SIM & MCBURNEY
(45) Issued: Apr. 1 , 2003
(22) Filed: Sep. 20, 1999
(41) Open to Public Inspection: Mar. 21, 2000
Examination requested: Sep. 20, 1999
(51) International Class (IPC): F25D 17/00
F25D 29/00
F26B 5/06
F26B 9/06
F26B 21/10
Patent Cooperation Treaty (PCT): No
(30) Application priority data: Application No. Country Date
09/157,526 United States Sep. 21, 1998
Availability of licence: N/A
Language of filing: English
Votes:34
Comments: 0