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. 18, 1990
Filed:
Jul. 19, 1988
Applicant:
Inventors:
Andreas Guentner, Frankenthal, DE;
Udo Mayer, Frankenthal, DE;
Andreas Oberlinner, Ludwigshafen, DE;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ; C07D / ; C07D / ;
U.S. Cl.
CPC ...
544129 ; 544130 ; 544131 ; 544143 ; 544151 ; 546135 ; 546194 ; 546196 ; 548374 ; 548455 ; 548524 ; 548525 ; 549398 ; 549399 ; 549404 ; 549407 ; 549408 ;
Abstract
Benzopyran derivatives of the formula ##STR1## where X is the radical ##STR2## and R.sup.1, R.sup.2, R.sup.3, R.sup.4 and also the ring A have defined meanings are used in pressure- or heat-sensitive layers.
Guentner, Andreas. (1990). Benzopyran derivatives (U.S. Patent No. 4958021). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4958021
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile