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:
Dec. 08, 1992
Filed:
Sep. 26, 1991
Applicant:
Inventors:
Assignee:
Asahi Kogyosha Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; B01D / ;
U.S. Cl.
CPC ...
55268 ; 553852 ; 454187 ;
Abstract
A clean room arrangement comprises a clean room having an upper portion and a lower portion. Clean air is introduced into the upper portion of the clean room, flows downward and expelled from the lower portion of the clean room. An air recirculation passage is connected to the clean room such that the lower portion of the clean room is communicated with the upper portion of the clean room. A heat source is provided in the air recirculation passage to generate an ascending flow of air in the air recirculation passage so that the air descends in the clean room due to natural convection.