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. 07, 1991
Filed:
Apr. 13, 1990
Applicant:
Inventors:
Jeffrey J Beaufoy, Prior Lake, MN (US);
Robert C Aigner, Ham Lake, MN (US);
Steven A Burke, Champlin, MN (US);
Assignee:
Tennant Company, Minneapolis, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
55 21 ; 55 96 ; 55273 ; 55300 ; 55304 ; 55521 ; 15352 ;
Abstract
A powered surface maintenance machine having an exhaust air system for dust control is equipped with air filters for removing dust from the air before exhausting it to atmosphere. Automatic means are provided to mechanically shake dust from the filters whenever enough has accumulated on them to adversely affect dust control. This filter cleaning is accomplished with no attention from the machine operator and does not interrupt the operation of the machine or the air flow needed for dust control.