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:
Apr. 18, 1978
Filed:
Mar. 24, 1976
Applicant:
Inventors:
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61K / ; C07D / ;
U.S. Cl.
CPC ...
2603 / ; 424269 ;
Abstract
The present invention relates to novel chromone derivatives having effective antiallergic action with low toxicity, which are shown by the following formula (I) ##STR1## wherein R is hydrogen or lower alkyl and A is ##STR2## (R' is hydrogen or lower alkyl) or ##STR3## and their physiologically acceptable salts.