Patents by Inventor Jozef Lucien Rudolf Cenens

Jozef Lucien Rudolf Cenens 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).

  • Polyurethanes having improved moisture resistance
    Patent number: 6111049
    Abstract: Thermoplastic polyurethanes are formed from a hydrogenated polydiene diol having from 1.6 to 2 terminal hydroxyl groups per molecule and a number average molecular weight between 500 and 20,000, an isocyanate having two isocyanate groups per molecule, and optionally a chain extender having two hydroxyl groups per molecule. The thermoplastic polyurethanes have excellent resistance to moisture as evidenced by retention of more than 70%, preferably at least 85%, of original tensile strength after aging in water for 7 days at a temperature of at least 70.degree. C. Preparation by a prepolymer method with subsequent addition of the chain extender is preferred.
    Type: Grant
    Filed: February 9, 1996
    Date of Patent: August 29, 2000
    Assignee: Shell Oil Company
    Inventors: Aisa Sendijarevic, Vahid Sendijarevic, Kurt C. Frisch, Jozef Lucien Rudolf Cenens, Dale L. Handlin, Jr., Steven S. Chin, Hector Hernandez
  • Use of polydiene diols in thermoplastic polyurethanes
    Patent number: 5925724
    Abstract: Thermoplastic polyurethanes are formed from a polydiene diol, preferably a hydrogenated polybutadiene diol, having from 1.6 to 2 terminal hydroxyl groups per molecule and a number average molecular weight between 500 and 20,000, an isocyanate having two isocyanate groups per molecule, and optionally a chain extender having two hydroxyl groups per molecule. The thermoplastic polyurethane composition is prepared by a prepolymer method. preferably a solventless prepolymer method using the branched chain extender.
    Type: Grant
    Filed: June 23, 1995
    Date of Patent: July 20, 1999
    Assignee: Shell Oil Company
    Inventors: Jozef Lucien Rudolf Cenens, Hector Hernandez