Patents by Inventor John D. Jernigan

John D. Jernigan 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 obtaining pure orthophosphoric acid from superphosphoric acid
    Patent number: 4083934
    Abstract: A process for obtaining pure orthophosphoric acid from superphosphoric acid is provided comprising:(a) hydrolyzing superphosphoric acid with water until a mixture of polyphosphoric acids and orthophosphoric acid is formed, wherein the total P.sub.2 O.sub.5 content of said mixture is from 65% to 70% and the poly P.sub.2 O.sub.5 content of said mixture is from 1% to 15% of the total P.sub.2 O.sub.5 ;(b) crystallizing said orthophosphoric acid from said mixture;(c) separating said orthophosphoric acid from said mixture; and(d) washing said orthophosphoric acid with an organic solvent having a low or limited solubility for orthophosphoric acid.
    Type: Grant
    Filed: January 18, 1977
    Date of Patent: April 11, 1978
    Assignee: Texasgulf Inc.
    Inventors: John D. Jernigan, Brooks M. Whitehurst