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:
Nov. 25, 1997
Filed:
Aug. 13, 1996
Paul F Stephan, Rockton, IL (US);
Other;
Abstract
A cloth bag filter is formed with a generally cylindrical porous sidewall through which a vacuum is drawn for filtering of contaminant from an air stream, an open upper end for connection to the vacuum source, and a generally closed but optionally porous lower end portion. The sidewall is sufficiently flexible such that it collapses radially inwardly when air is flowing therethrough, simultaneously causing the lower end portion of the bag to be drawn upwardly toward the upper end portion. Upper and lower rings are secured to the upper and lower end portions of the bag for radially supporting the end portions. The weight of the lower ring causes the lower portion of the bag to automatically drop when the vacuum source is turned off, thus causing the sidewall to automatically expand outwardly to a generally vertically hanging position, disrupting the cohesion of the contaminant collected thereon, and causing such contaminant to break-up and fall from the filter.