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:
May. 11, 1999
Filed:
May. 15, 1997
Steven L Boomgaarden, Rosemount, MN (US);
Tennant Company, Minneapolis, MN (US);
Abstract
A surface scrubbing machine includes a body, wheels for supporting the body am& cylindrical scrub brushes mounted on the body for cleaning an adjacent surface. There is a clean water solution tank on the body for supplying a cleaning solution to the surface to be cleaned. A recovery tank is positioned on the body and there is a vacuum system for suctioning used cleaning solution from the surface being cleaned and for conveying it to the recovery tank. A filter is positioned in the recovery tank and there is a pump for transferring filtered solution from the downstream side of the filter to the clean water solution tank. A conduit extends from adjacent the downstream side of the filter to atmosphere and there is a solenoid for intermittently opening and closing the conduit to apply intermittent pressure against the downstream side of the filter to remove soilage from its upstream sides