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. 30, 1982
Filed:
Sep. 08, 1980
Donald W Schoen, St. Paul, MN (US);
Jerry J Klug, Rosemount, MN (US);
Donaldson Company, Inc., Minneapolis, MN (US);
Abstract
A filter assembly (10) for the filtration of toxic gases from the air is disclosed, which includes a unitized cylindrical housing having oppositely disposed end covers (11, 12), with an inlet port (11a) in one end cover and an outlet port (13a) in the side wall. An annular, pleated filter element (21) extends between the end covers (11, 12) between perforated liners (18, 19), and a third, perforated liner (20) is spaced outwardly from the center or common liner (19) to provide an annular space therebetween which is filled with activated charcoal (27). Fines media (25, 26) are positioned on opposite sides of the activated charcoal (27). The first, pleated filter (21) and the second, charcoal filter (27) are thus mounted contiguous to one another on opposite sides of separating wall (19, 25), and extend between the end covers (11, 12) to provide filtration for air being drawn through the filter unit.