Patents by Inventor Xiao X. Rong

Xiao X. Rong 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).

  • Patent number: 6284933
    Abstract: A method of making TFPX using an SN2 type nucleophilic displacement reaction. The method includes reacting a nucleophilic fluorine molecule with a nonfluorinated-tetrahalo-p-xylene molecule. Exemplary nucleophilic fluorine molecules include, but are not limited to, CsF, KF, NaF and LiF. The nonfluorinated-tetrahalo-p-xylene molecules may include, &agr;,&agr;,&agr;′,&agr;′-tetrachloro-p-xylene, &agr;,&agr;,&agr;′,&agr;′-tetrabromo-p-xylene or &agr;,&agr;,&agr;′,&agr;′-tetraiodo-p-xylene. The reaction may be carried out in an open or closed container. Furthermore, the reaction may be carried out in the presence of a phase transfer catalyst. In certain embodiments, the reaction is carried in a substantially solvent-free environment.
    Type: Grant
    Filed: December 6, 1996
    Date of Patent: September 4, 2001
    Inventors: William R. Dolbier, Jr., Xiao X. Rong, Walter E. Stalzer
  • Patent number: 5849962
    Abstract: A process for the preparation of octafluoro-?2,2!paracyclophane includes contacting a reactant selected from the group consisting of 1,4-bis(bromodifluoromethyl)benzene (dibromide), 1,4-bis(chlorodifluoromethyl)benzene (dichloride), and 1,4-bis(iododifluoromethyl)benzene (diiodide) with trimethylsilyltributyltin (TMSTBT) (a reducing agent) and fluoride ions in a refluxing solution of hexamethylphosphoramide (HMPA) or dimethylsulfoxide (DMSO) in tetrahydrofuran (THF) at conditions effective to promote a reaction product comprising octafluoro-?2,2!paracyclophane.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: December 15, 1998
    Assignee: Specialty Coating Systems, Inc.
    Inventors: William R. Dolbier, Jr., Xiao X. Rong
  • Patent number: 5536892
    Abstract: A process for the preparation of octafluoro-[2,2]paracyclophane includes contacting a reactant selected from the group consisting of 1,4-bis (bromodifluoromethyl)benzene (dibromide), 1,4-bis (chlorodifluoromethyl)benzene (dichloride), and 1,4-bis (iododifluoromethyl)benzene (diiodide) with trimethylsilyltributyltin (TMSTBT) (a reducing agent) and fluoride ions in a refluxing solution of hexamethylphosphoramide (HMPA) or dimethylsulfoxide (DMSO) in tetrahydrofuran (THF) at conditions effective to promote a reaction product comprising octafluoro-[2,2]paracyclophane.
    Type: Grant
    Filed: October 18, 1995
    Date of Patent: July 16, 1996
    Assignee: Specialty Coating Systems, Inc.
    Inventors: William R. Dolbier, Jr., Xiao X. Rong