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:
Jan. 24, 2012
Filed:
Mar. 06, 2008
Applicants:
Kurt Clarence Adelman, Sauk Rapids, MN (US);
Karl Hansen, Cottage Grove, MN (US);
Inventors:
Kurt Clarence Adelman, Sauk Rapids, MN (US);
Karl Hansen, Cottage Grove, MN (US);
Assignee:
Tennant Company, Minneapolis, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A47L 9/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
An external filter box for a surface maintenance machine having a hopper with selective communication being provided between the filter box and the hopper to permit dusty air to flow from the hopper to the filter box and to permit dust and debris captured by the filter box to flow into the hopper. In one example, the hopper includes a prefilter assembly which is coupled to an inlet of the filter box during a sweeping operation and which is removed away from the filter box during a hopper dump procedure.