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. 23, 1999
Filed:
Dec. 01, 1997
Applicant:
Inventors:
David W Berg, Plymouth, MN (US);
Michael S Wilmo, Crystal, MN (US);
Assignee:
Tennant Company, Minneapolis, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A47L / ;
U.S. Cl.
CPC ...
15 83 ; 15 87 ; 153404 ;
Abstract
A surface maintenance machine includes a body, wheels for supporting the body, a sweeping brush and a debris hopper adjacent the sweeping brush and positioned to receive debris swept by the brush. The hopper has a floor, walls, and a top, all formed of a plastic material, preferably one rated as not supporting combustion in a horizontal direction. There is a heat shield attached to the underside of the hopper top, with the heat shield being formed of a non-combustible material.