Patents by Inventor R. Torrence Martin

R. Torrence Martin 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).

  • Patent number: 4474738
    Abstract: The present invention is directed to the removal of phosphorous material, such as apatite from phosphorous bearing materials, preferably those having a particle size less than 0.25 mm. The beneficiation treatment process comprises treating an aqueous phosphatic slurry with an alkaline EDTA complexing material. After contacting the aqueous mineral slurry with the complexing agent for a sufficient period of time, the divalent cation of apatite is complexed with the complexing material, which in turn releases the associated anionic species of apatite into solution for removal and recovery.
    Type: Grant
    Filed: September 28, 1982
    Date of Patent: October 2, 1984
    Inventor: R. Torrence Martin