Patents by Inventor Harold M. Ray

Harold M. Ray 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).

  • Sequential and selective flotation of sulfide ores containing copper and molybdenum
    Patent number: 5078860
    Abstract: A sequential flotation process for the separation of components of an ore containing sulfides of copper and molybdenum involves initially effecting selective flotation of the copper component directly from the ore by conditioning the ore with a combination of a source of bisulfite ion and causticized starch to produce a conditioned ore having a pH between approximately 5.2 and 6.2, and thereafter treating the conditioned ore with a collector selected from the group consisting of dialkyl dithiophosphates and alkyl dithiophosphinates.
    Type: Grant
    Filed: February 6, 1991
    Date of Patent: January 7, 1992
    Assignee: The Doe Run Company
    Inventors: Harold M. Ray, John C. Morrisey, IV
  • Sequential and selective flotation of sulfide ores
    Patent number: 5074994
    Abstract: A sequential flotation process for the separation of components of a sulfide ore selected from the group consisting of copper and lead sulfide containing ores and copper, zinc and lead sulfide containing ores in which the copper component is initially selectively floated directly from said ore by conditioning the ore with a combination of a source of bisulfite ion and causticized starch to produce a conditioned ore having a pH between approximately 5.7 and 6.5, and thereafter treating the conditioned ore with a collector selected from the group consisting of dialkyl dithiophosphates and alkyl dithiophosphinates.
    Type: Grant
    Filed: October 18, 1990
    Date of Patent: December 24, 1991
    Assignee: The Doe Run Company
    Inventors: Harold M. Ray, Nathaniel Arbiter