Patents by Inventor Daniel Yaodong Gan

Daniel Yaodong Gan 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).

  • Polyalkyldiallylamine-epihalohydrin resins as wet strength additives for papermaking and process for making the same
    Patent number: 6906133
    Abstract: The present invention relates to a process for making polyalkyldiallylamine-epihalohydrin resins, the resultant resins and their uses as wet strength additives for papermaking. These resins are obtained by a two step process, wherein the first step comprises the free radical polymerization or copolymerization of an alkyldiallylamine monomer in its protonated form; and the second step comprises reacting an ADAA polymer or copolymer with epihalohydrin under carefully controlled reaction conditions.
    Type: Grant
    Filed: January 3, 2003
    Date of Patent: June 14, 2005
    Assignee: Hercules Incorporated
    Inventors: Fang Deng, Daniel Yaodong Gan
  • Polyalkyldiallylamine-epihalohydrin resins as wet strength additives for papermaking and process for making the same
    Publication number: 20030166791
    Abstract: The present invention relates to a process for making polyalkyldiallylamine-epihalohydrin resins, the resultant resins and their uses as wet strength additives for papermaking. These resins are obtained by a two step process, wherein the first step comprises the free radical polymerization or copolymerization of an alkyldiallylamine monomer in its protonated form; and the second step comprises reacting an ADAA polymer or copolymer with epihalohydrin under carefully controlled reaction conditions.
    Type: Application
    Filed: January 3, 2003
    Publication date: September 4, 2003
    Inventors: Fang Deng, Daniel Yaodong Gan