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:
Jan. 14, 1992
Filed:
Mar. 16, 1990
Eberhard Kuehn, Hemhofen, DE;
Albert Hammerschmidt, Erlangen, DE;
Erwin Schmidt, Erlangen, DE;
Hellmut Ahne, Roettenbach, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
The invention provides photosensitive mixtures consisting of a polymer and a photoactive component which meet the requirements placed on photoresists. The polymer has carboxylic acid anhydride groups or phenolic hydroxyl groups and the photoactive component is an N-alkylated or N-arylated 1.4-dihydropyridine or a 1.4- dihydropyridine derivative of the following structure: ##STR1## where the R group is a (substituted) aryl group, which, in the ortho position to the bond with the dihydropyridine ring, carries a NO.sub.2 group; and R.sup.3 is alkyl, cyclohexyl or phenyl.