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:
Sep. 29, 1981
Filed:
May. 19, 1977
Applicant:
Inventor:
Hans-Peter Kuhlthau, Leverkusen, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09B / ; C09B / ; D06P / ; D06P / ;
U.S. Cl.
CPC ...
260158 ; 260155 ; 260156 ; 260208 ;
Abstract
Process for the preparation of benzthiazole dyestuffs by alkylation of compounds of the formula ##STR1## wherein R.sub.1 and R.sub.2 denote hydrogen, alkyl, alkenyl, cycloalkyl, aryl or aralkyl, or, conjointly with the N-atom, form a ring, or R.sub.1 can be linked to the o-position of the ring B and the rings A and B and the radicals R.sub.1 and R.sub.2 can contain non-ionic substituents and carbocyclic or heterocyclic rings can be fused to the rings A and B, with esters of the formula