Patents by Inventor Weiming Qiu

Weiming Qiu 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).

  • 3-Alkylated-5,5',6,6',7,7,'8,8'-octahydro-2,2'-binaphthols and 3,3'-dialkylated-5,5',6,6',7,7',8,8'-octahydro-2,2'-binaphthols and processes for making them
    Publication number: 20030100803
    Abstract: The compositions 3-alkylated-5,5′,6,6′,7,7′,8,8′-octahydro-2,2′-binaphthol and 3,3′-dialkylated-5,5′,6,6′,7,7′,8,8′-octahydro-2,2′-binaphthol are disclosed, as well as various processes for making them, all involving the alkylation of 5,5′,6,6′,7,7′,8,8′-octahydro-2,2′-binaphthol.
    Type: Application
    Filed: November 26, 2001
    Publication date: May 29, 2003
    Inventors: Helen S.M. Lu, Weiming Qiu, Rafael Shapiro
  • Amorphous tetrafluoroethylene-hexafluoropropylene copolymers
    Patent number: 6486280
    Abstract: Disclosed herein are novel amorphous tetrafluoroethylene-hexafluoropropylene (TFE-HFP) dipolymers, and other copolymers containing TFE, HFP and a third monomer, many of which are more random than previous amorphous TFE-HFP copolymers, as well as a novel high productivity continuous process for making these polymers. The polymers are particularly useful in the form of coatings, films and encapsulants.
    Type: Grant
    Filed: July 14, 2000
    Date of Patent: November 26, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Colin Anolick, Viacheslav Alexandrovich Petrov, Bruce Edmund Smart, Charles Winfield Stewart, Robert Clayton Wheland, William Brown Farnham, Andrew Edward Feiring, Weiming Qiu
  • Manufacture of 3,3,4,4-tetrahydroperfluoroalkanoates
    Patent number: 6376705
    Abstract: Esters and other carboxylic acid derivatives of 3,3,4,4-tetrahydroperfluoroalkylcarboxylic acids are made by the iron promoted reaction of an ester of bromodifluoroacetic acid or other carboxylic acid derivatives and a (perfluoroalkyl)ethylene. The resulting products may be converted to the corresponding alkali metal or ammonium carboxylate slits which are useful as surfactants in fluoroolefin polymerizations.
    Type: Grant
    Filed: May 22, 2000
    Date of Patent: April 23, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Weiming Qiu
  • Amorphous tetrafluoroethylene-hexafluoropropylene copolymers
    Patent number: 6133389
    Abstract: Disclosed herein are novel amorphous tetrafluoroethylene-hexafluoropropylene (TFE-HFP) dipolymers, and other copolymers containing TFE, HFP and a third monomer, many of which are more random than previous amorphous TFE-HFP copolymers, as well as a novel high productivity continuous process for making these polymers. The polymers are particularly useful in the form of coatings, films and encapsulants.
    Type: Grant
    Filed: June 6, 1997
    Date of Patent: October 17, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Colin Anolick, Viacheslav Alexandrovich Petrov, Bruce Edmund Smart, Charles Winfield Stewart, Robert Clayton Wheland, William Brown Farnham, Andrew Edward Feiring, Weiming Qiu
  • Manufacture of 3,3',5,5'-tetramethyl-2,2'-biphenol
    Patent number: 6077979
    Abstract: Coupling in aqueous medium of 2,4-dimethylphenol by persulfate anion or hydrogen peroxide in the presence of iron or iron compounds gives good yields of relatively pure 3,3',5,5'-tetramethyl-2,2'-biphenol.
    Type: Grant
    Filed: February 18, 1999
    Date of Patent: June 20, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Weiming Qiu
  • Fluorinated quaternary ammonium salts
    Patent number: 6054615
    Abstract: Selected quaternary ammonium salts containing fluoroalkyl, preferably perfluoroalkyl, groups that are stable to bases are described. They are useful as phase transfer reaction catalysts, especially in basic media.
    Type: Grant
    Filed: May 27, 1999
    Date of Patent: April 25, 2000
    Assignee: E.I. du Pont de Nemours and Company
    Inventor: Weiming Qiu
  • Amorphous tetrafluoroethylene-hexafluoropropylene copolymers
    Patent number: 5637663
    Abstract: Disclosed herein are novel amorphous tetrafluoroethylene-hexafluoropropylene (TFE-HFP) dipolymers, and other copolymers containing TFE, HFP and a third monomer, many of which are more random than previous amorphous TFE-HFP copolymers, as well as a novel high productivity continuous process for making these polymers. The polymers are particularly useful in the form of coatings, films and encapsulants.
    Type: Grant
    Filed: February 5, 1996
    Date of Patent: June 10, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Colin Anolick, Viacheslav A. Petrov, Bruce E. Smart, Charles W. Stewart, Robert C. Wheland, William B. Farnham, Andrew E. Feiring, Weiming Qiu