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:
Jul. 23, 2002
Filed:
Nov. 09, 2001
Michael C. Campbell, Virginia Beach, VA (US);
Other;
Abstract
A gaseous-material evacuation system includes a filter assembly ( ) with a housing ( ) containing filter material ( ) with a downstream porous filter member ( ) at a downstream side of the filter material. The filter assembly includes a valve ( ) with a movable valve member ( ) for moving in a direction of gas flow and having a breadth area dimension that is at least as great as that of the downstream surface of the downstream porous filter member. In a preferred embodiment, a spring member ( ) presses the movable valve member ( ) against the porous filter member ( ), thereby stopping gaseous flow, but yields when gaseous materials are driven through the filter at a predetermined pressure. The valve member is mounted in a sub-compartment ( ) of the housing, which is of a single-piece housing member.