Patents by Inventor Charles William Hyndman

Charles William Hyndman 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).

  • Viscosity index improving additives for phosphate ester-containing hydraulic fluids
    Patent number: 5863999
    Abstract: Polymer compositions derived from selected alkyl (meth)acrylate ester monomers used in certain weight ratios to provide improved viscosity control and low temperature performance characteristics in phosphate ester aircraft hydraulic fluids is disclosed. Polymer compositions for use as viscosity index improving additives in aircraft hydraulic fluids contain from 40 to 100 weight percent (C.sub.1 -C.sub.10)alkyl (meth)acrylate and zero to 60 weight percent (C.sub.11 -C.sub.20)alkyl (meth)acrylate monomer units. Preferred polymer compositions based on 40 to 70 weight percent (C.sub.1 -C.sub.10)alkyl (meth)acrylate and 30 to 60 weight percent (C.sub.11 -C.sub.15)alkyl (meth)acrylate monomer units combine good solubility in the phosphate ester hydraulic fluids with good viscosity control at low and high temperatures.
    Type: Grant
    Filed: April 20, 1998
    Date of Patent: January 26, 1999
    Assignee: Rohm and Haas Company
    Inventors: Bernard George Kinker, Robert Howard Gore, Charles William Hyndman, Bridget Marie Stevens
  • Viscosity index improving additives for phosphate ester-containing hydraulic fluids
    Patent number: 5817606
    Abstract: Polymer compositions derived from selected alkyl (meth)acrylate ester monomers used in certain weight ratios to provide improved viscosity control and low temperature performance characteristics in phosphate ester aircraft hydraulic fluids is disclosed. Polymer compositions for use as viscosity index improving additives in aircraft hydraulic fluids contain from 40 to 100 weight percent (C.sub.1 -C.sub.10)alkyl (meth)acrylate and zero to 60 weight percent (C.sub.11 -C.sub.20)alkyl (meth)acrylate monomer units. Preferred polymer compositions based on 40 to 70 weight percent (C.sub.1 -C.sub.10)alkyl (meth)acrylate and 30 to 60 weight percent (C.sub.11 -C.sub.15)alkyl (meth)acrylate monomer units combine good solubility in the phosphate ester hydraulic fluids with good viscosity control at low and high temperatures.
    Type: Grant
    Filed: July 24, 1997
    Date of Patent: October 6, 1998
    Assignee: Rohm and Haas Company
    Inventors: Bernard George Kinker, Robert Howard Gore, Charles William Hyndman, Bridget Marie Stevens