Patents by Inventor Baishen Liang

Baishen Liang 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).

  • Co-production of perfluoromethyl perfluorovinyl ether and perfluoroethyl perfluorovinyl ether
    Patent number: 5777179
    Abstract: A process for the production of perfluoromethyl perfluorovinyl ether (PMVE) and perfluoroethyl perfluorovinyl ether (PEVE) from hexafluoropropylene epoxide (HFPO) and a mixture comprising carbonyl fluoride (CF) and perfluoroacetyl fluoride (PAF) is disclosed. The process includes a step (a) involving the reaction of hexafluoropropylene epoxide (HFPO) with a mixture of carbonyl fluoride (CF) and perfluoroacetyl fluoride (PAF) to produce a mixture of 2,3,3,3-tetrafluoro-2-(trifluoromethoxy)propionic acid fluoride (PMPF) and 2,3,3,3-tetrafluoro-2-(pentafluoroethoxy)propionic acid fluoride (PEPF). In a second step, a mixture of PMPF and PEPF made in the step (a) is dehalocarbonylated to produce a mixture of PMVE and PEVE.
    Type: Grant
    Filed: May 24, 1996
    Date of Patent: July 7, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Baishen Liang, Ming-Hong Hung, Paul Raphael Resnick