Patents by Inventor Randhir C. Chopra

Randhir C. Chopra 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).

  • Removal of chromium, chromate, molybdate and zinc
    Patent number: 4057494
    Abstract: Trivalent chromium, zinc, hexavalent chromate and molybdate can be removed from a fluid by contacting the fluid with an ion exchange resin bed comprising a mixture of a weak base anion exchange resin and a weak or strong acid cation exchange resin in hydrogen form to remove the metal values.
    Type: Grant
    Filed: July 14, 1976
    Date of Patent: November 8, 1977
    Assignee: Chemical Separations Corporation
    Inventor: Randhir C. Chopra
  • Removal of chromium, chromate, molybdate and zinc
    Patent number: 3972810
    Abstract: Trivalent chromium, hexavalent chromate, molybdate and zinc are removed from a fluid. The fluid is simultaneously treated with a weak base anion exchange resin and a weak acid cation exchange resin to remove the chromium, chromate, molybdate and/or zinc.
    Type: Grant
    Filed: July 15, 1974
    Date of Patent: August 3, 1976
    Assignee: Chemical Separations Corporation
    Inventor: Randhir C. Chopra