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. 28, 1981
Filed:
Sep. 04, 1979
John A Hyatt, Kingsport, TN (US);
Stephen E French, Rochester, NY (US);
Cataldo A Maggiulli, Pittsford, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Disclosed is a process for the preparation of certain 1-aryl-3-amino-5-pyrazolones by reacting a 3-nitropropionic acid ester with certain aryldiazonium salts to produce intermediate .alpha.-nitrohydrazones and then reducing the intermediate to give the corresponding aminopyrazolones. The aryl group may be, for example, phenyl, 4-methoxyphenyl, or the like, the diazo anion can be, e.g., Br.sup.-, Cl.sup.-, BF.sub.4.sup.-, or SO.sub.4.sup..dbd., and the ester alcohol moiety can be any convenient, unreactive group, preferably alkyl. The aminopyrazolones are useful for the preparation of photographic couplers.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile