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:
Sep. 01, 1992
Filed:
Feb. 20, 1990
Ion I Inculet, London, CA;
John R Lackner, Westlake, OH (US);
James C Murphy, Broadview Hts., OH (US);
The Scott Fetzer Company, Westlake, OH (US);
Abstract
A vacuum cleaner is disclosed having an on-board electrostatic filtration device for removing ultra fine particles from the suction air stream which is discharged into the vacuum cleaner's dirt collection receptacle. The electrostatic filtration device includes a finely woven conductive mesh made from two electrically insulated sets of conductive filaments between which a low voltage electrical potential difference is applied. The polarity of the electrical potential difference is periodically reversed at low frequency to assist in maintaining filtering effectiveness notwithstanding the accumulation on the mesh of significant amounts of retained particulate matter. High permitivity material is incorporated between filaments to enhance electric fields in the mesh created by the electrical potential difference.