Patents by Inventor Charles G. Hill, Jr.

Charles G. Hill, Jr. 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).

  • Gas phase fractionation method using porous ceramic membrane
    Patent number: 5487774
    Abstract: Flaw-free porous ceramic membranes fabricated from metal sols and coated onto a porous support are advantageously used in gas phase fractionation methods. Mean pore diameters of less than 40 .ANG., preferably 5-20 .ANG. and most preferably about 15 .ANG., are permeable at lower pressures than existing membranes. Condensation of gases in small pores and non-Knudsen membrane transport mechanisms are employed to facilitate and increase membrane permeability and permselectivity.
    Type: Grant
    Filed: November 8, 1993
    Date of Patent: January 30, 1996
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Reid A. Peterson, Charles G. Hill, Jr., Marc A. Anderson
  • One step method for the preparation of difurfuryl diamines
    Patent number: 5292903
    Abstract: A synthetic procedure for the synthesis of diamino difurfuryl compounds via a one-step, low-temperature reaction that does not require additional steps for the protection of the amino functionalities in the reactant or the deprotection of the amino functionalities in an intermediate product to give the final product is disclosed. The importance of acid concentration, reaction temperature, and reaction time to the one step method are disclosed.
    Type: Grant
    Filed: August 22, 1991
    Date of Patent: March 8, 1994
    Assignee: The United States Department of Agriculture as represented by the Secretary of Agriculture
    Inventors: Anthony H. Conner, Michael S. Holfinger, Charles G. Hill, Jr., William J. McKillip, Rolf H. Reimann