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. 12, 1981
Filed:
Jul. 16, 1979
Larry J Bresina, St. Paul, MN (US);
Richard D Hipp, Rushseba Township, Chisago County, MN (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
An apparatus for applying toner particles to a photoconductive surface having multiple magnetic brushes each of which consists essentially of a magnetic inner shaft and a nonmagnetizeable outer sleeve, with both the sleeve and the inner shaft of each brush being capable of independent rotation. The apparatus uses an adjustably mounted doctor blade to apply toner particles to one of the brushes. The rotation of the inner shafts and sleeves of the brushes, the spacings between the brushes, as well as the magnetic attraction between the brushes affords the transfer of toner from this first brush to the other brushes. Following the transfer of toner, each brush is able to apply toner to the photoconductive surface.