Patents by Inventor Robert M. Harper

Robert M. Harper 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).

  • Polyvinylbutyral interlayer sheet with improved adhesion to glass and a process for preparing same
    Patent number: 7462664
    Abstract: The present invention is an improved PVB composition comprising an adhesion control agent which is a mixture of potassium and magnesium salts in a ratio of from about 0.05:1 to about 5:1, by weight, potassium salts to magnesium salts. The present invention also describes a method for improved control of adhesion of PVB to glass.
    Type: Grant
    Filed: July 29, 2003
    Date of Patent: December 9, 2008
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Rebecca L. Smith, Donald L. Rymer, Robert M. Harper, Dan J. McKiernan
  • POLYVINYLBUTYRAL INTERLAYER SHEET WITH IMPROVED ADHESION TO GLASS AND A PROCESS FOR PREPARING SAME
    Publication number: 20080277045
    Abstract: The present invention is an improved PVB composition comprising an adhesion control agent which is a mixture of potassium and magnesium salts in a ratio of from about 0.05:1 to about 5:1, by weight, potassium salts to magnesium salts. The present invention also describes a method for improved control of adhesion of PVB to glass.
    Type: Application
    Filed: July 25, 2008
    Publication date: November 13, 2008
    Applicant: E.I. du Pont de Nemours and Company
    Inventors: Rebecca L. Smith, Donald L. Rymer, Robert M. Harper, Dan J. McKiernan