Patents by Inventor John H. Underwood

John H. Underwood 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).

  • Multiple autofrettage
    Patent number: 7818986
    Abstract: A manufacturing method includes a first step of performing swage autofrettage on an object; a second step of heat soaking the object; and a third step of performing hydraulic autofrettage on the object. The second and third steps may be repeated one or more times. A final step may be heat soaking the object. The object may be, for example, a pressure vessel or gun barrel.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: October 26, 2010
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Anthony P. Parker, Edward Troiano, John H. Underwood
  • Poly(ether esters) of phthalic acid salts and di(halomethyl) ether
    Patent number: 3943164
    Abstract: Poly(ether esters) are prepared by reacting a phthalic acid salt with a di(haloalkyl) ether in a polar solvent using a phosphonium salt catalyst. The resulting poly(ether esters) are useful in olefin polymers to improve dye receptivity.
    Type: Grant
    Filed: December 5, 1972
    Date of Patent: March 9, 1976
    Assignee: Phillips Petroleum Company
    Inventors: Donnie G. Brady, Harold R. Deck, Faber B. Jones, John H. Underwood
  • Dyeable polymers of alpha-olefins containing a nickel salt and a terephthalic ester
    Patent number: 3933707
    Abstract: Alpha-olefin polymers made dyeable by the addition of a mixture of a nickel compound and an ester of terephthalic acid.
    Type: Grant
    Filed: March 11, 1971
    Date of Patent: January 20, 1976
    Assignee: Phillips Petroleum Company
    Inventors: Ronald D. Mathis, John H. Underwood, James S. Dix