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:
Feb. 09, 1993
Filed:
Mar. 01, 1991
Applicant:
Inventors:
Hans-Jurgen Beck, Baar, DE;
Gabriele Nowara, Mauer, DE;
Assignee:
Heidelberger Druckmaschinen Ag, Heidelberg, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B41F / ; B41F / ;
U.S. Cl.
CPC ...
101142 ; 101148 ; 1014501 ; 1014161 ; 204218 ; 2042 / ; 205117 ; 205127 ; 205151 ;
Abstract
Apparatus for controlling the wetting behavior of the surface of a cylinder formed of passivatable metal. A wetting device is used to apply an electrolyte to the surface of the metal cylinder. A direct current source is connected between the wetting device and the cylinder and a control device is used to control the voltage necessary for passivating the surface of the cylinder as a function of the pH value of the electrolyte and the type of metal forming the surface of the cylinder. The oleophilic or oleophobic characteristics of the cylinder are thus controlled.