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. 31, 1998
Filed:
Aug. 12, 1996
Applicant:
Inventors:
David R Hult, St. Peters, MO (US);
Donald M Kolehmainen, Menominee, MI (US);
Jeffrey L Young, St. Peters, MO (US);
Assignee:
Emerson Electric Co., St. Louis, MO (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
55486 ; 55487 ; 55498 ; 55502 ;
Abstract
A two stage vacuum cleaner filter is disclosed. The filter includes a first stage outer filter extending in a closed circumferential path with a second stage inner filter located in immediate proximity to and within the first stage outer filter. Sealing elements for securing opposite ends of the first stage outer filter and second stage inner filter to each other are provided. The second stage inner filter stops particles that might leak through the first stage outer filter.