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:
Jul. 17, 1979
Filed:
Aug. 08, 1978
Applicant:
Inventors:
Hans Baumann, Wachenheim, DE;
Andreas Oberlinner, Ludwigshafen, DE;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
544 70 ; 544 58 ; 544 60 ; 544 61 ; 544150 ; 544230 ; 544378 ; 2603261 ; 428411 ;
Abstract
Spirodipyrans of the formula ##STR1## where A is the radical of a fused benzene ring or 2,1-naphthalene ring, the rings being unsubstituted or substituted by alkyl, alkoxy, nitro, chlorine, bromine or carbalkoxy,
Baumann, Hans. (1979). Spirodipyrans (U.S. Patent No. 4161589). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4161589
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile