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. 15, 1994
Filed:
Mar. 18, 1993
Applicant:
Inventors:
Gilbert W Burnett, Rockwall, TX (US);
Robert B Holland, Rowlett, TX (US);
Assignee:
Dust Free, Inc., Royse City, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B03C / ;
U.S. Cl.
CPC ...
96 55 ; 55496 ; 96 68 ; 96 80 ;
Abstract
An adjustable filter uses an eight member frame construction to provide a wide range of filter sizes. A panel for encasing one or more layers of filtering materials within the frame is formed from a grid having a border which unevenly encompasses the crossbars of the panel in order to allow various sizes of panels to be formed without producing exposed barbs and without increasing the air resistance of the filter. An embodiment using an electric field is disclosed to enhance the filtering properties of the filter.