Patents by Inventor Eddie C. J. Chou

Eddie C. J. Chou 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: 4917726
    Abstract: Waste materials containing chromium, such as the sludge resulting from neutralization of chromic acid bleed streams from metal cleaning and plating operations, are (1) rendered innocuous for land fill purposes by heating to temperatures of at least about 700.degree. C. to stabilize the materials for safe disposal and (2) activated by heating to temperatures of about 400.degree. to 500.degree. and the chromium content in the resulting calcine can be recovered by thermite reduction.
    Type: Grant
    Filed: October 26, 1988
    Date of Patent: April 17, 1990
    Assignee: Amax Inc.
    Inventors: Eddie C. J. Chou, Leo W. Beckstead, Charles J. Kucera, Jr., Pandelis Papafingos
  • Patent number: 4758266
    Abstract: Nickel powder of high surface area is produced by pressurized hydrogen reduction of an ammoniacal aqueous nickel sulfate solution using a small amount of a catalytic reductant compound exemplified by formaldehyde sulfoxalate (rongalite).
    Type: Grant
    Filed: August 11, 1986
    Date of Patent: July 19, 1988
    Assignee: Amax Inc.
    Inventor: Eddie C. J. Chou
  • Patent number: 4600435
    Abstract: Nickel and cobalt contained in aqueous sulfate solution are separately recovered by counter-current solvent extraction using a cobalt-selective organic extractant while scaling of equipment and cobalt recycle are minimized by controlling aqueous pH at the extraction, scrubbing and stripping stages to maximize cobalt loading and selectivity of the extractant while loading scale-causing ions such as calcium and magnesium in the extractant and removing them from the circuit with the aqueous cobalt strip solution.
    Type: Grant
    Filed: August 24, 1984
    Date of Patent: July 15, 1986
    Assignee: AMAX Inc.
    Inventors: Ben W. Wiegers, Eddie C. J. Chou, John D. Bruno, Helen S. Leaver
  • Patent number: 4545814
    Abstract: Ultrafine cobalt and nickel powders are produced from sulfate solutions containing ammonia under hydrogen pressure in the presence of a small amount of a reductant from the group consisting of metal hydrides, metal borohydrides and metal borides. Cobalt powders having a particle size of about 2 micrometers produced in accordance with the invention have been used successfully in the production of cobalt-cemented tungsten carbide.
    Type: Grant
    Filed: May 23, 1984
    Date of Patent: October 8, 1985
    Assignee: AMAX Inc.
    Inventors: Eddie C. J. Chou, Mark W. Cooperrider
  • Patent number: 4097575
    Abstract: A method is provided for enhancing the neutralization capability of high-magnesium serpentine silicate ore in the neutralization of nickel-containing pregnant leach solution, said solution having a pH of less than about 1 which comprises, providing said high magnesium serpentine ore in particulate form containing by weight over about 5% magnesium, roasting said ore under oxidizing conditions at a temperature below that temperature at which forsterite in said ore recrystallizes, and then adding an amount of said serpentine roasted ore to said pregnant liquor sufficient to raise the pH of the leach solution to a level above 2.
    Type: Grant
    Filed: November 5, 1976
    Date of Patent: June 27, 1978
    Assignee: Amax Inc.
    Inventors: Eddie C. J. Chou, Craig B. Barlow, Dale K. Huggins
  • Patent number: 4094754
    Abstract: Nickel is selectively leached efficiently and rapidly from Ni-Cu-Fe-S matte under oxidizing conditions at ordinary pressure by controlling in combination the following variables: (1) the acid-to-copper mole ratio in the leaching solution, (2) the temperature, and (3) the sulfur content of the matte, whereby an enriched nickel solution is obtained low in copper and iron.
    Type: Grant
    Filed: March 7, 1977
    Date of Patent: June 13, 1978
    Assignee: Amax Inc.
    Inventors: Raymond D. Symens, Paul B. Queneau, Eddie C. J. Chou, Franklin F. Clark