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:
Aug. 14, 2012
Filed:
Mar. 31, 2009
Bryce Mark Rampersad, Bloomingdale, IL (US);
Robert Rex Sever, Arlington Heights, IL (US);
Balazs Hunek, Chicago, IL (US);
Theodore Hall Gasteyer, Iii, Naperville, IL (US);
Bryce Mark Rampersad, Bloomingdale, IL (US);
Robert Rex Sever, Arlington Heights, IL (US);
Balazs Hunek, Chicago, IL (US);
Theodore Hall Gasteyer, III, Naperville, IL (US);
Praxair Technology, Inc., Danbury, CT (US);
Abstract
A freeze-dryer and method of controlling the same is provided. The disclosed freeze-dryer includes a chamber adapted to hold material or product to be freeze-dried; one or more depressurization orifices; a gas pressurization circuit having a source of gas to pressurize the chamber to a prescribed pressure; a depressurization circuit coupled to the chamber via the one or more orifices and having a depressurizing control valve; and a control unit adapted to pressurize the chamber with the source of gas and actuate the depressurizing control valve to depressurize the chamber upon command. The ratio of total depressurization orifice area to the chamber volume is preferably between about 6×10and about 4×10m/m.