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. 13, 1981
Filed:
Apr. 30, 1979
Applicant:
Inventors:
Anselm Rothe, Birkenau, DE;
Werner Guthlein, Mannheim, DE;
Walter Rittersdorf, Mannheim, DE;
Wolfgang Werner, Mannheim, DE;
Assignee:
Boehringer Mannheim GmbH, Mannheim, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ; C07D / ; C07D / ;
U.S. Cl.
CPC ...
546180 ; 546333 ; 546149 ; 422 56 ;
Abstract
Bis-(2,4-dinitrophenyl)-methylpyridinium compounds useful as a pH indicator or for the detection of ammonia having the formula: ##STR1## wherein one of R.sub.1 and R.sub.2 is a bis-(2,4-dinitrophenyl)-methyl radical and the other is a lower alkyl radical;