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:
Jan. 29, 1991
Filed:
Aug. 21, 1989
Hans L Melgaard, Minneapolis, MN (US);
Despatch Industries, Inc., Minneapolis, MN (US);
Abstract
A material heating oven for sterilizing items for use in a sterile environment or the like comprising a hot air supply device having a filter, a cool air supply device having a filter, an oven cavity separate from the hot air supply and cool air supply devices, and a dampering system for selectively drawing air from the hot air supply and cool air supply devices to regulate the temperature of the oven cavity. Both the hot air supply and cool air supply devices include independent air recirculation loops for maintaining substantially constant temperature airstreams from which selected quantities of air are exchanged with the oven cavity. The nearly constant temperature airstreams prevent the filters in the devices from being thermally stressed which may cause them to shed particles to the clean environment. An electrically controlled temperature control system is used to regulate the temperature of the airstream flowing through the hot air supply and cool air supply devices.