Patents by Inventor Richard A. Lundgard

Richard A. Lundgard 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).

  • Anisotropic microporous syndiotactic polystyrene membranes and a process for preparing the same
    Patent number: 4980101
    Abstract: This invention relates to semi-permeable anisotropic syndiotatic polystyrene microporous membranes and a process for preparing such membranes.
    Type: Grant
    Filed: July 14, 1989
    Date of Patent: December 25, 1990
    Assignee: The Dow Chemical Company
    Inventors: Henry N. Beck, Robert D. Mahoney, Hawk S. Wan, Richard A. Lundgard
  • Process for the production of fibers from poly(etheretherketone)-type polymers
    Patent number: 4904426
    Abstract: A process for preparing microporous poly(etheretherketone)-type fibers comprising forming an extrusion mixture of at least one unsulphonated poly(etheretherketone)-type polymer and a solvent comprising at least one organic compound consisting predominantly of carbon and hydrogen, wherein the organic compound has a molecular weight of between about 160 and 450, contains at least one six membered aromatic ring structure, possesses a boiling point of between about 240 and 480 degrees Celsius, and is capable of dissolving at least about 10 weight percent of the poly(etheretherketone)-type polymer present at the extrusion temperature, extruding to form solid or hollow fibers, conveying the fibers through at least one quench zone, conveying the fibers through at least one leach zone, and drying the fibers, wherein the fibers so formed possess interconnecting or non-interconnecting pores.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: February 27, 1990
    Assignee: The Dow Chemical Company
    Inventors: Richard A. Lundgard, Henry N. Beck