Patents by Inventor Lewellyn G. Picklesimer

Lewellyn G. Picklesimer 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).

  • Purification of acetylene-terminated polyimide oligomers
    Patent number: 4307220
    Abstract: A process for purifying an acetylene-terminated polyimide oligomer containing residual solvent in which the oligomer is initially dissolved in the same solvent used as the reaction medium in its synthesis. After precipitating the oligomer from solution by mixing with an aqueous solution of potassium or sodium chloride, the precipitated oligomer is washed successively with a plurality of liquids of decreasing polarity to provide an oligomer free of residual solvent.
    Type: Grant
    Filed: December 5, 1979
    Date of Patent: December 22, 1981
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Michael A. Lucarelli, Lewellyn G. Picklesimer
  • Synthesis of acetylene-terminated compounds
    Patent number: 4226800
    Abstract: Phenolic materials containing propargyl groups are prepared by reacting a polyhydric, phenolic material with propargyl bromide, the reaction being conducted in an aqueous sodium hydroxide solution. The products can be thermally polymerized to polymers which are useful as adhesives and as matrix resins in the fabrication of composites.
    Type: Grant
    Filed: June 14, 1979
    Date of Patent: October 7, 1980
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Lewellyn G. Picklesimer
  • Acetylene-terminated polyimide compositions
    Patent number: 4187359
    Abstract: A composition of matter comprising an acetylene-terminated polyimide oligomer and trinitriloacetonitrile. The composition has a retarded cure rate, thereby facilitating the fabrication of void-free molded objects and composites.
    Type: Grant
    Filed: December 6, 1978
    Date of Patent: February 5, 1980
    Inventors: Lewellyn G. Picklesimer, Michael A. Lucarelli, Theodore J. Reinhart, Jr.