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. 20, 1993
Filed:
Oct. 22, 1991
Richard K Helling, Martinez, CA (US);
Kent P Steele, Indianapolis, IN (US);
Terrill E Applebury, Lafayette, CA (US);
DowElanco, Indianapolis, IN (US);
Abstract
Polychlorodipyridoimidazolium tetrachloroferrate compounds, such as 1,2,3,4,11-pentachloro-8-(trichloromethyl)dipyrido[1,2-a:1',2'-]imidazol-1 0-ium tetrachloroferrate, which are obtained as by-products in the preparation of polychloropyridine and polychloropicoline compounds by chlorination of many chloro(trichloromethyl)pyridine compounds in the presence of ferric chloride catalyst and can be prepared by heating a mixture of a chloro-2-(trichloromethyl)pyridine compound with a 2-chloro-5-(trichloromethyl)pyridine compound, can be converted to pentachloropyridine by chlorination at temperatures above about 230.degree. C. and pressures above about 300 psig (2.17 mPa).