Patents by Inventor Harvey H. Hoehn

Harvey H. Hoehn 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).

  • Separation and recovery of B and T lymphocytes
    Patent number: 4256588
    Abstract: A process for the separation of B and T lymphocytes comprising passing a suspension of a mixture over a bed of synthetic polymer granules whereby the B leukocytes adhere to the granules and the T lymphocytes pass through the bed.
    Type: Grant
    Filed: November 2, 1979
    Date of Patent: March 17, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Harvey H. Hoehn, Stephen T. Toy
  • Separation and recovery of granulocytes from blood using adherence on an expandable bed of a polymeric material
    Patent number: 4255267
    Abstract: A leukapheresis process is disclosed in which an expandable bed of synthetic polymeric packing having a diameter of from 90 .mu.m to 2000 .mu.m and preferably 200 .mu.m to 400 .mu.m is used to adhere granulocytes from blood. The granulocytes are harvested from the packing by expanding the bed and washing with a physiologically acceptable solution.
    Type: Grant
    Filed: November 2, 1979
    Date of Patent: March 10, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Harvey H. Hoehn, John R. Wells
  • Laser production of lithographic printing plates
    Patent number: 4054094
    Abstract: The use of a laser beam to etch the surface of a printing plate made from a polymer composition on a metal or plastic base and a thin top coating of a hard hydrophilic material produces a lithographic printing plate capable of accepting ink in the etched region and accepting water in the unetched regions.
    Type: Grant
    Filed: December 19, 1973
    Date of Patent: October 18, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Jack R. Caddell, Harvey H. Hoehn
  • Aromatic polyimide, polyester and polyamide separation membranes
    Patent number: RE30351
    Abstract: Gas separation membranes are made from aromatic polyimides, polyesters and polyamides in which the repeating unit of the main polymer chain(a) has at least one rigid divalent subunit, the two main chain single bonds extending from which are not colinear,(b) is sterically unable to rotate 360.degree. around at least one of these bonds, and(c) has 50% or more of its main chain atoms as members of aromatic rings.
    Type: Grant
    Filed: May 18, 1976
    Date of Patent: July 29, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Harvey H. Hoehn, John W. Richter