Patents by Inventor Richard Allen Hayes

Richard Allen Hayes 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).

  • Process for the hydrolysis of adiponitrile and the production of nylon 6,6 utilizing low catalyst levels
    Patent number: 6084056
    Abstract: A process for the hydrolysis of a dinitrile (e.g., adiponitrile) utilizing from 0.1 to 500 mmoles of catalyst (e.g., a mixture of phosphorous acid and calcium hypophosphite) per mole of the dinitrile and in the presence of from 0.01 to 0.5 moles of a dicarboxylic acid cocatalyst (e.g., adipic acid) followed by addition of a diamine (e.g., hexamethylenediamine) and heating to produce polymerization. Such a process is particularly useful in the production of nylon 6,6 having a low BHMT content and improved melt stability.
    Type: Grant
    Filed: December 22, 1998
    Date of Patent: July 4, 2000
    Assignee: E. I. Dupont de Nemours & Company
    Inventors: Richard Allen Hayes, David Neil Marks, Maria de Jesus Van Eijndhoven
  • Process for the hydrolysis of adiponitrile and the production of nylon 6,6 using dicarboxylic acids as the sole catalyst
    Patent number: 6075117
    Abstract: A process for the hydrolysis of a dinitrile (e.g., adiponitrile) utilizing a dicarboxylic acid (e.g., adipic acid) as the sole catalyst followed by addition of a diamine (e.g., hexamethylenediamine) and heating to produce polymerization. Such a process is particularly usefull in the production of nylon 6,6 having a low BHMT content and improved melt stability.
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: June 13, 2000
    Assignee: E.I. Dupont De Nemours & Company
    Inventors: Richard Allen Hayes, David Neil Marks, Maria Van Eijndhoven
  • Polyacetal compositions containing at least one acetylated hindered amine light stabilizer
    Patent number: 5981635
    Abstract: Incorporation into polyacetal compositions of at least one hindered amine light stabilizer which contains a hindered nitrogen that is acetylated results in a composition having good light stability, thermal stability, and physical property retention after exposure to heat and air.
    Type: Grant
    Filed: November 16, 1992
    Date of Patent: November 9, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Richard Allen Hayes
  • Process for transesterification of olefin/acrylic-ester copolymers
    Patent number: 5656692
    Abstract: Copolymers comprising olefin and alkyl-acrylate-ester repeat units are transesterified by olefin-containing alcohols in the presence of an alkali metal alkoxide catalyst. The transesterified polymers are especially useful as curable elastomers.
    Type: Grant
    Filed: September 4, 1996
    Date of Patent: August 12, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Richard Allen Hayes