Patents by Inventor John L. Crow, Jr.

John L. Crow, 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).

  • Preparation of ferric sulfate solutions
    Patent number: 4036941
    Abstract: A process for recovery of iron from an iron mud containing a mixture of gypsum and ferric hydroxide, which comprises contacting said gypsum and ferric hydroxide mixture with sulfuric acid of a concentration between 93 and 98% for a period of 1 to 12 hours, removing the undissolved material and recovering the iron as a 25 to 50% ferric sulfate solution.
    Type: Grant
    Filed: April 8, 1976
    Date of Patent: July 19, 1977
    Assignee: American Cyanamid Company
    Inventors: Bruce K. Boyles, John L. Crow, Jr.