Patents by Inventor Nelson H. Douglass

Nelson H. Douglass 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).

  • Reinforcing structural rebar and method of making the same
    Patent number: 5763042
    Abstract: The present invention provides a reinforcing structural rebar. The rebar comprises an inner core formed by pultruding reinforcing fibers through a bath of a first resin material, the inner core typically containing at least about 40 percent by weight reinforcing fibers and an outer cladding of a corrosion resistant and reinforced second resin material.
    Type: Grant
    Filed: June 28, 1994
    Date of Patent: June 9, 1998
    Assignees: Reichhold Chemicals, Inc., Marshall Industries Composites
    Inventors: Mark A. Kaiser, Sean P. Walsh, Nelson H. Douglass
  • Method of making reinforcing structural rebar
    Patent number: 5650109
    Abstract: The present invention provides a reinforcing structural rebar. The rebar comprises an inner core formed by pultruding reinforcing fibers through a bath of a first resin material, the inner core typically containing at least about 40 percent by weight reinforcing fibers and an outer cladding of a corrosion resistant and reinforced second resin material.
    Type: Grant
    Filed: September 28, 1995
    Date of Patent: July 22, 1997
    Assignees: Reichhold Chemicals, Inc., Marshall Industries Composites
    Inventors: Mark A. Kaiser, Sean P. Walsh, Nelson H. Douglass
  • Method of making prepreg
    Patent number: 5609806
    Abstract: A formable prepreg, and a method of making a formable prepreg by a pultrusion process. The method includes (a) impregnating reinforcing fiber with a thermosetting resin matrix, and (b) passing the resin impregnated reinforcing fiber through a die within which the resin impregnated reinforcing fiber is subjected to conditions sufficient to thicken the thermosetting resin matrix, to provide a formable prepreg. The present invention also provides a method of making a molded article using the prepreg of the present invention.
    Type: Grant
    Filed: June 28, 1994
    Date of Patent: March 11, 1997
    Assignee: Reichhold Chemicals, Inc.
    Inventors: Sean P. Walsh, Nelson H. Douglass