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. 07, 1981
Filed:
Feb. 09, 1978
Applicant:
Inventors:
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2603 / ; 2603 / ;
Abstract
Novel halogenomethylene-indoxyls [halogeno-(3-oxa-[2H]- indol-2-ylidene)-acetic acids] and a novel process for their preparation by reacting N-acylanilides with dihalogenomaleic anhydrides or derivatives thereof are described. The novel halogenomethylene-indoxyls are valuable intermediates for the preparation of pharmaceutical active compounds having anti-allergic properties.