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. 14, 1978
Filed:
Feb. 17, 1976
Reinhold Arneth, Budenheim, DT;
Rudi Schwandt, Wiesbaden-Erbenheim, DT;
Hoechst Aktiengesellschaft, Frankfurt am Main, DT;
Abstract
A process and apparatus for developing a latent electrostatic image on an electrophotographic copying material by means of a toner dispersion. An infeed roller applies the toner dispersion to the copying material, and, downstream thereof, a distribution roller acts on the surface of the copying material. To solve the problem of reproducing fine white indicia, such as thin white lines, on a black background, a voltage, having the same polarity as the surface charge of the latent electrostatic image on the copying material, is applied to the distribution roller. Squeegee rollers downstream of the distribution roller effect removal of unused toner. Toner, which adheres to the distribution roller during application of voltage to the distribution roller, is sprayed off and recovered for recycling, the spraying agent being toner dispersion.