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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Kaletta; Bernd
Address:
Langenfeld, DE
No. of patents:
4
Patents:












Patent Number Title Of Patent Date Issued
6174635 Electrophotographic recording material containing metal-free phthalocyanines January 16, 2001
An electrophotographic recording material comprising a conductive support and a photosensitive layer containing a photoconductive crystalline substituted metal-free phthalocyanine compound and/or mixed crystals of said substituted metal-free phthalocyanine compounds with unsubstituted
5721080 Electrophotographic material containing particular phthalocyanines February 24, 1998
An electrophotographic recording material comprising a conductive support and a photosensitive layer containing a photoconductive crystalline substituted metal-free phthalocyanine compound and/or mixed crystals of said substituted metal-free phthalocyanine compounds with unsubstituted
5525152 Pigment salts and their use for dyeing and pigmenting June 11, 1996
The present invention relates to a process for coloring polymeric materials by dyeing or pigmenting said polymeric materials with a pigment salt having the formula (I): ##STR1## and tautomeric forms thereof, wherein M.sup.n+ is an n-valent cation.
5367069 Metal-free, substituted phthalocyanines in the .chi.-modification November 22, 1994
Metal-free phthalocyanines in the .chi.-modification substituted in up to four ortho positions can be prepared by tetramerisation of a reaction mixture consisting of phthalonitriles substituted in the 3-position with phthalonitrile in a molar ratio of 4:0 to 1:40 in the presence of a bas










 
 
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