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:
Jan. 17, 1978
Filed:
Oct. 18, 1976
Mathias J Vola, Sittard, NL;
Oce-van der Grinten N.V., Venlo, NL;
Abstract
A magnetic roller comprising a diamagnetic cylinder rotatable about magnetic poles which extend axially inside the cylinder and are each formed by similar poles of magnets lying axially beside each other is made to generate a substantially homogeneous magnetic field over its full working width, thus enabling the magnets to be made of strongly ferromagnetic, anisotropic material, by the provision, over and along one or more of the magnetic poles between the magnetic pole and the diamagnetic cylinder, of a material having high magnetic permeability, such as a strip of soft iron of between 0.1 and 1 mm. in thickness fixed to and not wider than the surface of the magnetic pole. The magnetic roller is especially useful in electrophotographic developing apparatus for transporting magnetically attractable developing powder between a powder reservoir and a developing zone in which powder from a magnetic brush formed on the cylinder is applied to electrostatic images on imagewise exposed photoconductive sheet material.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile