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:
Nov. 10, 1987
Filed:
May. 23, 1986
Applicant:
Inventors:
Erich Hammerschmidt, Bergisch Gladbach, DE;
Horst Behre, Odenthal, DE;
Heinz U Blank, Odenthal, DE;
Dietmar Mayer, Bergisch Gladbach, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
2605 / ;
Abstract
Solid crystalline tetra-alkali metal salts of chromotropic acid, a process for their isolation and their use for the preparation of pure chromotropic acid or di-alkali metal salts of chromotropic acid.