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. 28, 1992
Filed:
Sep. 30, 1988
Applicant:
Inventors:
Wolfgang Schrott, Ludwigshafen, DE;
Peter Neumann, Wiesloch, DE;
Sibylle Brosius, Mannheim, DE;
Helmut Barzynski, Duerkheim, DE;
Klaus D Schomann, Ludwigshafen, DE;
Harald Kuppelmaier, Heidelberg, DE;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; C07C / ; C07C / ; C09B / ;
U.S. Cl.
CPC ...
558162 ; 560 42 ; 560 45 ; 560 53 ; 560116 ; 560119 ; 562433 ; 562452 ; 562454 ; 562456 ; 562457 ; 562458 ; 562462 ; 562466 ; 562498 ; 562501 ; 564163 ; 564164 ; 564169 ; 564188 ; 564428 ; 564452 ; 564454 ; 564453 ; 564456 ; 564460 ; 568327 ; 568374 ; 430 70 ;
Abstract
Azulenesquaric acid dyes of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each have specified meanings are prepared from azulene derivatives of the formula ##STR2## where R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each have specified meanings as intermediates, and used in an optical recording medium.