Patents by Inventor G. Glenn Lipscomb, II

G. Glenn Lipscomb, II 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).

  • Composition useful in process for preparing powadir membranes from tetrahalobisphenol a polycarbonates
    Patent number: 4962131
    Abstract: The invention is a composition useful for the preparation of POWADIR membranes of a bisphenol-based polycarbonate wherein at least 25 percent by weight of the bisphenol moieties are tetrahalogenated, wherein the halogen is Cl or Br, the composition comprising (i) a bisphenol-based polycarbonate wherein at least 25 percent by weight of the bisphenol moieties are tetrahalogenated, wherein the halogen is Cl or Br, (ii) a solvent for such polycarbonate, and (iii) a non-solvent for such polycarbonate. The composition is useful for extruding membranes wherein the membranes formed are POWADIR membranes with a discriminating region capable of separating oxygen from nitrogen.The composition of this invention allows the formation of membranes with excellent physical properties, good separation factors for oxygen and nitrogen, with excellent fluxes.
    Type: Grant
    Filed: November 6, 1987
    Date of Patent: October 9, 1990
    Assignee: The Dow Chemical Company
    Inventors: Henry N. Beck, Edgar S. Sanders, Jr., G. Glenn Lipscomb, II
  • Process for preparing POWADIR membranes from tetrahalobisphenol A polycarbonates
    Patent number: 4772392
    Abstract: The invention is a process for the preparation of a POWADIR membrane comprising bisphenol-based polycarbonates wherein at least 25 percent by weight of the bisphenol moieties are tetrahalogenated wherein the halogen is Cl or Br, and the membrane prepared by such process.
    Type: Grant
    Filed: November 6, 1987
    Date of Patent: September 20, 1988
    Assignee: The Dow Chemical Company
    Inventors: Edgar S. Sanders, Jr., Daniel O. Clark, John A. Jensvold, Henry N. Beck, G. Glenn Lipscomb, II, Frederick L. Coan