Patents by Inventor William Hollis Ehlig

William Hollis Ehlig 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).

  • Hydrogen fluoride process
    Patent number: 4120939
    Abstract: Anhydrous hydrogen fluoride is manufactured by dropping small particles of a metal fluoride, e.g., calcium fluoride, through a reaction zone countercurrent to a gas stream containing sulfur trioxide, sulfuric acid and water vapor.
    Type: Grant
    Filed: May 26, 1977
    Date of Patent: October 17, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: William Hollis Ehlig