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:
Mar. 16, 1982
Filed:
Apr. 28, 1980
R Claude Marsh, Albuquerque, NM (US);
Pure Air Corporation, Canoga Park, CA (US);
Abstract
A laminar flow clean air enclosure has at least two spaced apart side walls and a planar filter extending between the side walls to define a work area. A transition duct couples air between the outlet of a blower and an entrance region near one end of the filter inlet to expand air leaving the blower outlet without introducing turbulence. A plenum chamber in communication with the entrance region and substantially the entire cross-sectional area of the filter inlet is formed so as to provide air at constant velocity to substantially the entire cross section of the filter inlet. As a result, the velocity of the air leaving the blower outlet is gradually reduced without turbulence to the desired exit velocity for the air leaving the filter. A perforated screen having a planar central region and an angled peripheral region covers the filter outlet. The peripheral region presents a higher density perforations than the central region and thereby forms between the side walls an air curtain that partially defines the work region.