Patents by Inventor David H. Roach

David H. Roach 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).

  • Low temperature process for making polyurethaneureas
    Patent number: 5879596
    Abstract: A process for making polyurethaneureas using cryogenic mixing is provided. Such polyurethaneureas are useful for making spandex and, ultimately, various types of clothing. The process involves cooling an isocyanate prepolymer or the like to a temperature of less than about -100.degree. C., forming a powder from the isocyanate prepolymer, adding at least one chain extender and/or chain terminator, and warming the powder to at least about room temperature to produce a polyurethaneurea. Such polyurethaneureas are useful for making spandex and, ultimately, various types of clothing.
    Type: Grant
    Filed: July 15, 1997
    Date of Patent: March 9, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: David H. Roach