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:
May. 05, 1987
Filed:
Apr. 21, 1986
Applicant:
Inventors:
Joseph B Tedder, Jr, Baton Rouge, LA (US);
J Robert Adams, Jr, Baton Rouge, LA (US);
Assignee:
Ethyl Corporation, Richmond, VA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
423300 ;
Abstract
Polymer-grade cyclic phosphonitrilic halide trimer can be obtained by (i) reacting ammonium halide with phosphorus pentahalide in an inert solvent containing pyridine, substituted pyridines or mixtures thereof or hydrogen halide complexes thereof, (ii) washing the solvent phase with an aqueous alkali metal hydroxide and (iii) crystallizing cyclic trimer and/or distilling the cyclic trimer to obtain polymer-grade trimer.