Patents by Inventor Harold G. Spencer

Harold G. Spencer 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).

  • Method for separating serum albumin and gamma globulin
    Patent number: 5310877
    Abstract: The invention is directed to a method for the separation of gamma globulin from albumin contained in an aqueous solution of both having a pH of 8-10 by ultrafiltration using an altered substrate microfilter having a water permeability of no more than 20 gallons per square foot per day per pound per square inch.
    Type: Grant
    Filed: April 8, 1993
    Date of Patent: May 10, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Harold G. Spencer
  • Method for reducing the pore size of sintered metal filters by application of an alcoholic solution of a metal alkoxide which is converted to an insoluble hydrous metal oxide
    Patent number: 5130166
    Abstract: The invention is a process for modifying pore size near the surface of porous materials. The surface is contacted with an alcohol solution of a metal alkoxide which forms a hydrous oxide insoluble in water, an amount of water insufficient to hydrolyze fully the metal alkoxide, and a mineral acid for a time sufficient for the solution to penetrate the surface region but not the bulk. This is followed by exposing to sufficient moisture to complete hydrolysis and then curing to stabilize the metal oxide in the pores near the surface.
    Type: Grant
    Filed: December 14, 1990
    Date of Patent: July 14, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Harold G. Spencer
  • Filtration device having hardened gum formed-in-place membranes
    Patent number: 5043069
    Abstract: Stable formed-in-place saccharinic gum membranes on a porous support, the membranes being modified by contact with at least an equivalent of multivalent cations to anionic groups in the gum.
    Type: Grant
    Filed: October 18, 1989
    Date of Patent: August 27, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Steven C. Brandon, Harold G. Spencer