Patents by Inventor Heinn F. Tomfohrde, III

Heinn F. Tomfohrde, III 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).

  • Process for the production of gamma butyrolactone THF in predetermined amounts
    Patent number: 5149836
    Abstract: This invention provides a vapor phase process for the production of gamma-butyrolactone and tetrahydrofuran in a predetermined ratio by the steps of: hydrogenating a vapor mixture of maleic anhydride and excess hydrogen over a first bed of a Cu-Zn-Al catalyst, and directly contacting the crude reactor effluent therefrom with hydrogen over a second bed of Cu-Zn-Cr catalyst during a predetermined contact time and at a defined temperature, using selected amounts of catalyst in each bed.
    Type: Grant
    Filed: July 25, 1991
    Date of Patent: September 22, 1992
    Assignee: ISP Investments Inc.
    Inventors: Waldo De Thomas, Paul D. Taylor, Heinn F. Tomfohrde, III