Patents by Inventor Michael H. Yeh

Michael H. Yeh 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).

  • Compositions including cationic polymers and anionic xanthan gum
    Patent number: 5552462
    Abstract: A novel blend composition comprising one or more cationic polygalactomannas and xanthan gum is provided. The blend is capable of producing enhanced viscosities when distributed in a solvent. The blend is suitable for use in foods, explosives, oil field chemicals, textile fibers, agricultural chemicals and cosmetics.
    Type: Grant
    Filed: November 22, 1993
    Date of Patent: September 3, 1996
    Assignee: Rhone-Poulenc Inc.
    Inventor: Michael H. Yeh
  • Derivatized guar gum composition and process for making it
    Patent number: 5536825
    Abstract: Derivatized guar gum which demonstrates greater than 75% light transmission at a wavelength of from about 500-600 nanometers when dispersed in water in the amount of 0.5 parts per 100 parts water and the process for producing such guar gum is disclosed.
    Type: Grant
    Filed: June 9, 1994
    Date of Patent: July 16, 1996
    Assignee: Rhone-Poulenc Inc.
    Inventors: Michael H. Yeh, Ian William Cottrell
  • Guar gum composition and process for making it
    Patent number: 5489674
    Abstract: Guar gum which demonstrates greater than 75% light transmission at a wavelength of from about 500-600 nanometers when dispersed in water in the amount of 0.5 parts per 100 parts water and the process for producing such guar gum is disclosed.
    Type: Grant
    Filed: June 9, 1994
    Date of Patent: February 6, 1996
    Assignee: Rhone-Poulenc Inc.
    Inventor: Michael H. Yeh
  • Modified hydrophobic cationic thickening compositions
    Patent number: 5473059
    Abstract: Water soluble quaternary ammonium ethers of polysaccharides or polyols wherein the quaternary ammonium ether substituents correspond to the formula ##STR1## wherein R.sub.1 is a monohydroxylated or polyhydroxylated alkyl group containing between about one and about six carbon atoms; R.sub.2 and R.sub.3 are independently, alkyl groups containing between about one and about six carbon atoms; R.sub.4 is an alkyl group containing between about six and about 24 carbon atoms; and X is a halide, wherein the degree of substitution of said ethers ranges from about 0.001 to about 0.5. is provided. The composition have multiple uses as thickeners and are particularly suited for use in personal care products.
    Type: Grant
    Filed: October 13, 1994
    Date of Patent: December 5, 1995
    Assignee: Rhone-Poulenc Inc.
    Inventor: Michael H. Yeh
  • Modified hydrophobic cationic thickening compositions
    Patent number: 5387675
    Abstract: Water soluble quaternary ammonium ethers of polysaccharides or polyols wherein the quaternary ammonium ether substituents correspond to the formula ##STR1## wherein R.sub.1 is a monohydroxylated or polyhydroxylated alkyl group containing between about one and about six carbon atoms; R.sub.2 and R.sub.3 are independently, alkyl groups containing between about one and about six carbon atoms; R.sub.4 is an alkyl group containing between about six and about 24 carbon atoms; and X is a halide, wherein the degree of substitution of said ethers ranges from about 0.001 to about 0.5. is provided. The composition have multiple uses as thickeners and are particularly suited for use in personal care products.
    Type: Grant
    Filed: March 10, 1993
    Date of Patent: February 7, 1995
    Assignee: Rhone-Poulenc Specialty Chemicals Co.
    Inventor: Michael H. Yeh
  • Amphoteric polysaccharide compositions
    Patent number: 5378830
    Abstract: A novel blend composition comprising one or more cationic polysaccharides and one or more anionic polysaccharides is provided. The blend is capable of producing enhanced viscosities when distributed in a solvent. The blend is suitable for use in foods, explosives, oil field chemicals, textile fibers, paper production, personal care products, agricultural chemicals and cosmetics.
    Type: Grant
    Filed: September 1, 1993
    Date of Patent: January 3, 1995
    Assignee: Rhone-Poulenc Specialty Chemicals Co.
    Inventor: Michael H. Yeh
  • Process for derivatizing polygalactomannan using water soluble aluminum salts in the process
    Patent number: 4959464
    Abstract: In an aqueous process for derivatizing polygalactomannan gums, the derivatized product prior to washing is reacted with a water soluble aluminum salt. The resulting products hydrate readily under alkaline pH conditions.
    Type: Grant
    Filed: November 7, 1988
    Date of Patent: September 25, 1990
    Assignee: Hi-Tek Polymers, Inc.
    Inventor: Michael H. Yeh