Patents by Inventor John A. Hedge

John A. Hedge 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 of cyclic compounds with molecular sieve adsorbent
    Patent number: 4014949
    Abstract: Selective adsorption of one cyclic compound from a fluid mixture with a structurally similar cyclic compound can be obtained with molecular sieves (crystalline aluminosilicate zeolites) which have been partially dehydrated at a temperature in the range of 80.degree.-300.degree.C. Preferably the Al/Si ratio in the zeolite framework is in the range of 0.2-0.65. For example, m-xylene can be separated from p-xylene by selective adsorption of the m-xylene on NaY zeolite which was partially dehydrated at 125.degree. C. and contains about 12 wt % water by ignition analysis.
    Type: Grant
    Filed: December 19, 1973
    Date of Patent: March 29, 1977
    Assignee: Sun Ventures, Inc.
    Inventor: John A. Hedge
  • Catalyst for the oxidation of butane to maleic anhydride
    Patent number: 3968054
    Abstract: A catalyst comprising SB-Ni-Mo has been found to be very selective, stable and long-lasting in the conversion of butane to maleic anhydride. Other metals such as Co, Cu, or Zn may be substituted for Ni with like results. An improved method for preparing this catalyst is also provided herein.
    Type: Grant
    Filed: April 21, 1975
    Date of Patent: July 6, 1976
    Assignee: Sun Ventures, Inc.
    Inventors: Wesley E. Cherry, Alan F. Dickason, John A. Hedge