Patents by Inventor Henry K. Hui

Henry K. Hui 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).

  • Sensor with overcoating and process for making same
    Patent number: 4919891
    Abstract: A sensor comprising a sensing element capable of sensing a component in an aqueous medium and an overcoating at least partially covering the sensing element. The overcoating comprises a water insoluble, component permeable, cross-linked cellulosic material and an effective amount of an opaque agent.
    Type: Grant
    Filed: May 15, 1987
    Date of Patent: April 24, 1990
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Masao Yafuso, Henry K. Hui, Cheng F. Yan, William W. Miller
  • Optical fiber event sensor
    Patent number: 4886338
    Abstract: A micro pH sensor is constructed by reacting powdered aminoalkylated cellulose with a dye to covalently bond the dye to the aminoalkyl groups on the cellulose. Any excess unreacted aminoalkyl groups are blocked with a blocking agent and the dye containing powdered cellulose is taken up in a solvent. A portion of the solvated dye containing cellulose is deposited in association with an optical fiber. The cellulose is regenerated into a solid matrix by acid treatment of the solvated dye containing cellulose to deposit the dye containing celllulose matrix on the optical fiber.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: December 12, 1989
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Masao Yafuso, Henry K. Hui
  • Optical sensor
    Patent number: 4849172
    Abstract: An optical sensor which is a gas permeable silicone polymeric matrix having at least one optical indicator therein for providing an optical signal in response to excitation light. The optical indicator essentially comprises a mixture of non-polar derivatives of a polynuclear aromatic compound.
    Type: Grant
    Filed: January 29, 1988
    Date of Patent: July 18, 1989
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Masao Yafuso, Cheng F. Yan, Henry K. Hui, William W. Miller
  • Micro sensor
    Patent number: 4798738
    Abstract: A micro pH sensor is constructed by reacting powdered aminoalkylated cellulose with a dye to covalently bond the dye to the aminoalkyl groups on the cellulose. Any excess unreacted aminoalkyl groups are blocked with a blocking agent and the dye containing powdered cellulose is taken up in a solvent. A portion of the solvated dye containing cellulose is deposited in association with an optical fiber. The cellulose is regenerated into a solid matrix by acid treatment of the solvated dye containing cellulose to deposit the dye containing cellulose matrix on the optical fiber.
    Type: Grant
    Filed: October 10, 1986
    Date of Patent: January 17, 1989
    Assignee: Cardiovascular Devices, Inc.
    Inventors: Masao Yafuso, Henry K. Hui