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:
Aug. 15, 1978
Filed:
Oct. 29, 1976
Petrus J Ophey, Grubbenvorst, NL;
OCE-van der Grinten N.V., Venlo, NL;
Abstract
In electrographic copying apparatus of the type in which a powder image is transferred from a moving surface to a surface moving in pressing contact with it and then is transferred from the latter surface to a sheet of copy paper, pollution of the transfer station by powder is avoided by providing one of the two surfaces with at least one receding surface portion which recedes away from the other surface so as not to make contact with it, and causing a receding surface portion to be positioned opposite to the other surface so that the two surfaces are not in contact when no image transfer is being effected, such, for instance, as when powder images are not being formed or when a copy sheet is not being supplied so as to receive an image formed. Preferably, a roller for receiving and transferring each powder image from a moving photoconductive belt or drum is provided with two diametrically opposite receding surface portions located between two image receiving surface portions each of which is formed by a soft resilient coating layer, the area of which is the same as or slightly smaller than that of the sheet of copy paper.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile