Patents by Inventor Taher Abou Chakra

Taher Abou Chakra has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Linear polychlorophosphazenes possessing a dichlorothiophosphoryl terminal group, process for preparation of said compounds and utilization thereof
    Patent number: 4554113
    Abstract: Linear polychlorophosphazenes having a dichlorothiophosphoryl terminal group and corresponding to the formulaCl.sub.2 (S)P--NPCl.sub.2 ].sub.n Clwherein n is a number equal to or more than 4.The aforesaid linear polychlorophosphazenes are prepared by polycondensing P.sub.2 NSCl.sub.5 by heating under conditions adequate for liberating PSCl.sub.3.These polymers can be applied to all the uses of the classical polychlorophosphazenes.
    Type: Grant
    Filed: July 6, 1984
    Date of Patent: November 19, 1985
    Assignee: Societe Nationale Elf Aquitaine
    Inventors: Taher Abou Chakra, Roger De Jaeger