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:
Nov. 30, 1977
Applicant:
Inventor:
Gottfried Lange, Erlangen, DE;
Assignee:
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03G / ; G03G / ;
U.S. Cl.
CPC ...
2503152 ; 430103 ; 118654 ; 355 / ; 427 141 ;
Abstract
In an exemplary embodiment, a charge image resulting from x-ray exposure of a plate originally charged to 1.5 to 5 kV, is developed by applying powder of opposite polarity while applying a voltage of from 1 to 4.5 kV, also of opposite polarity, to a conductive backing for neutralizing the effect of image background charge. A grid is spaced a small distance from the charge image and receives a voltage of about 1000 volts for controlling edge emphasis. For a positive charge image and negatively charged powder, a negative potential of e.g. -2500 volts may be applied to the backing for the photoconductive layer and +1000 volts may be applied to the grid.