Patents by Inventor Carl H. Manwiller

Carl H. Manwiller 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).

  • Polyimide molding resins and molded articles
    Patent number: 4755555
    Abstract: Particulate polyimide molding resin characterized by high surface area and low crystallinity and molded articles prepared therefrom having unusually high toughness.
    Type: Grant
    Filed: November 10, 1986
    Date of Patent: July 5, 1988
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Carl H. Manwiller, Waifong L. Anton
  • Polyimide molding resins and molded articles
    Patent number: 4622384
    Abstract: Particulate polyimide molding resin characterized by high surface area and low crystallinity and molded articles prepared therefrom having unusually high toughness.
    Type: Grant
    Filed: April 26, 1985
    Date of Patent: November 11, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Carl H. Manwiller
  • Oxidatively stable polyimide compositions
    Patent number: 4360626
    Abstract: Graphite-filled polyimide compositions of excellent high temperature stability obtained through use of graphite having low reactive impurity content.
    Type: Grant
    Filed: April 24, 1981
    Date of Patent: November 23, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Carl H. Manwiller
  • Ram-extrusion apparatus for non-melt fabricable polymeric resins
    Patent number: 4266919
    Abstract: In an apparatus for the ram-extrusion of non-melt fabricable polymeric resin comprising means for forcing the resin through a forming die from an extrusion chamber, the improvement wherein the ram head comprises at least about 10 percent fluoropolymer.
    Type: Grant
    Filed: August 9, 1979
    Date of Patent: May 12, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Gordon B. Dunnington, Carl H. Manwiller
  • Poly(meta-phenylene isophthalamide) molding compositions
    Patent number: 4243574
    Abstract: Poly(meta-phenylene isophthalamide) comprising encapsulated filler, a process for the preparation of these compositions by addition of the filler to the polymer solution before precipitation, and molded articles prepared from these materials characterized by increased strength at equal filler loadings.
    Type: Grant
    Filed: March 30, 1979
    Date of Patent: January 6, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Carl H. Manwiller
  • Method of and apparatus for ram-extrusion of aromatic polyimide and polyamide resins, and shaped articles formed using such method and apparatus
    Patent number: 4238538
    Abstract: A method of forming a shaped article from non-melt fabricatable, high temperature, polymeric (polyimide and polyamide) resins, using an apparatus including a die with compaction, back pressure and relief zone. Such resins are ram-extruded at a temperature of between about 20.degree. C. and 400.degree. C., but below the second order glass transition temperature of the resin to form a shaped article, followed by heating at a temperature above about 250.degree. C. for a time sufficient to coalesce the resin. Such method and apparatus is particularly well-suited to produce close tolerance articles of precise dimensions, such as rods and tubes.
    Type: Grant
    Filed: December 21, 1978
    Date of Patent: December 9, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Carl H. Manwiller