Patents by Inventor Harold N. Hedrick

Harold N. Hedrick 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).

  • Method of using higher concentration sulfuric acid for stripping and precipitation of adsorbed magnesium
    Patent number: 4493907
    Abstract: This invention relates to the regeneration of cation exchanger resin containing adsorbed magnesium ions, and the recovery of the magnesium as a crystalline precipitate. The regeneration uses moderate to high concentration aqueous H.sub.2 SO.sub.4, and the recovered precipitate comprises one or more co-crystallization compounds of MgSO.sub.4 and H.sub.2 SO.sub.4.
    Type: Grant
    Filed: March 23, 1983
    Date of Patent: January 15, 1985
    Assignee: American Petro Mart, Inc.
    Inventors: Harold N. Hedrick, Solon G. Whitney
  • Method and apparatus for folded moving bed ion exchange system
    Patent number: 4385993
    Abstract: Apparatus and operating method improvements are provided for an ion exchange apparatus system utilizing moving folded beds for loading and regeneration of the resin. The improvements include separate treatment and pulse chambers in the resin circuit from the loading column to the regeneration column, and in the return circuit from the regeneration column to the loading column. With the improved apparatus and method, the resin is transferred in compacted metered increments from and into the loading and regeneration columns.
    Type: Grant
    Filed: June 22, 1981
    Date of Patent: May 31, 1983
    Assignee: American Petro Mart, Inc.
    Inventors: Harold N. Hedrick, Solon G. Whitney