Patents by Inventor H. N. Cheng

H. N. Cheng 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).

  • Methyl acrylate-diamine based polyamide resins and processes for producing the same
    Publication number: 20030153722
    Abstract: The present invention contemplates poly(aminoamide) pre-polymers, polyamide polymers, a multi-step process for the synthesis of these pre-polymers and polymers using acrylates and at least one monomer containing at least two primary amines, and the resins resulting from the reaction of the polymers with an epihalohydrin. These resins may be used as wet strength resins and creping aids in the papermaking industry as well as surface additives for wool.
    Type: Application
    Filed: December 27, 2001
    Publication date: August 14, 2003
    Applicant: Hercules Incorporated
    Inventors: Qu-Ming Gu, Armin Michel, H. N. Cheng, William W. Maslanka, Ronald R. Staib
  • Hydrophobically esterified starch products and process of making the same
    Publication number: 20020123624
    Abstract: A hydrophobically esterified starch, is disclosed, having the general formula: 1
    Type: Application
    Filed: February 23, 2001
    Publication date: September 5, 2002
    Inventors: Lei Qiao, Qu-Ming Gu, H. N. Cheng
  • Galactosylated hydroxyalkyl polysaccharides
    Patent number: 6433161
    Abstract: Galactosylated hydroxyalkyl polysaccharides wherein galactose moieties are bound to the hydroxyalkyl polysaccharide by galactosidic bonds, and a process for preparing the galactosylated hydroxyalkyl polysaccharides having the steps: a) providing at least one hydroxyalkyl polysaccharide; and b) treating said hydroxyalkyl polysaccharide with a galactose donor in the presence of galactosidase enzyme for a time sufficient to convert at least a portion of said hydroxyl groups to galactosides.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: August 13, 2002
    Assignee: Hercules Incorporated
    Inventors: H. N. Cheng, Robert G. Nickol, George Wang, Jun Li
  • Esterified polysaccharide products and beta-lactone ring opened ketene dimer products containing the compositions, and process of making the same
    Publication number: 20020106747
    Abstract: Esterified polysaccharides and the process of making such products are disclosed. The process can be enzymatic where an enzyme is used as a catalyst for the reaction. The process can also be chemical where no enzyme is used. Novel Products are obtained through lipase-catalyzed &bgr;-lactone ring opening alcoholysis of ketene dimers and the process of making such compositions containing products.
    Type: Application
    Filed: February 6, 2002
    Publication date: August 8, 2002
    Inventors: H. N. Cheng, Qu Ming Gu
  • Reduced molecular weight galactomannans oxidized by galactose oxidase
    Publication number: 20020076769
    Abstract: Presented are compositions of reduced molecular weight galactomannans, particularly guar gum, which have been oxidized by the enzyme galactose oxidase. Further, the invention relates to a process for enzymatically reducing the molecular weight of a galactomannan wherein the galactomannan is simultaneously or subsequently oxidized using galactose oxidase, optionally in combination with other enzymes including peroxidases and or catalases. This process enables production of high concentrations of oxidized galactomannans, which have particular use in the paper making industry.
    Type: Application
    Filed: August 2, 2001
    Publication date: June 20, 2002
    Inventors: Richard Brady, H. N. Cheng, Alfred Jacques Haandrikman, Allison B. Moore, Pong-Kuen Kuo, William T. McNabola, Charles R. Wheeler, Zu-Feng Xu, Richard James Riehle, Tuyen Thanh Nguyen, Hielke T. Jeerd de Vries, John Arthur Lapre