Patent

Autoclave Control During Pressure Oxidation of Molybdenite: U.S. Patent 6,818,191 (2004).

Producing Pure MoO3 from Low-grade Molybdenite Concentrates: U.S. Patent 6,730,279 (2004).

Pickling of Refractory Metals: U.S. Statutory Invention Registration H2087H (2003).

Inhibiting Lead Leaching in Water: U.S. Patents 5,544,859, 5,632,285 and 6,013,382 (‘96, ’97, ‘00).

Electrolytic Dissolution and Control of NiS Scale, U.S. Patent 4,627,900 (1986).

Recovery of Alumina Values from Alunite Ore, U.S. Patent 4,618,480 (1986).

Stripping of Tungsten from Organic Solvents, U.S. Patent 4,450,144 (1984).

Recovery of Vanadium and Nickel from Petroleum Coke, U.S. Patent 4,443,415 (1984).

Silica Control during Acid Pressure Leaching of Nickel Laterites, U.S. Patent 4,399,109 (1983).

Precipitation of Low-sulfur Calcium Tungstate, U.S. Patent 4,397,821 (1983).

Digestion of Scheelite Concentrates, U.S. Patent 4,351,808 (1982).

WO3 Feedback Control in an APT Process, U.S. Patent 4,325,919 (1982).

Combined Treatment of Wolframite and Scheelite, U.S. Patent 4,320,096 (1982).

Processing of Refractory Tungsten Concentrates, U.S. Patent 4,320,095 (1982).

Upgrading of Scheelite Concentrates, U.S. Patent 4,313,914 (1982).

Separation of SiO2, P2O5 and F from Tungsten, U.S. Patent 4,311,679 (1982).

Separation of Molybdenum from Tungsten, U.S. Patent 4,303,623 (1981).

Processing Concentrates with High MoO3/WO3 Ratio, U.S. Patent 4,303,622 (1981).

Cell for Electrolytic Oxidation of Ni(OH)2, U.S. Patent 4,183,792 (1980).

Atmospheric Leach Ion-exchange Process for Recovery of Copper and Nickel, U.S. Patent 4,100,043 (1978).

Leaching of Ni/Cu/Fe/S Matte, U.S. Patent 4,094,754 (1978).

Sulfuric Acid Leaching of Nickeliferous Laterite, U.S. Patent 4,044,096 (1977).

Separation of Cobalt from Nickel by Ozonation, U.S. Patent 4,034,059 (1977).

High-temperature Neutralization of Nickel Laterite, U.S. Patent 3,991,159 (1976).

Atmospheric Leaching of Nickel-Copper-Cobalt Matte Containing Iron, U.S. Patent 3,962,051 (1976).

Selenium Rejection during Acid Leaching of Nickel-Copper Matte, U.S. Patent 3,959,097 (1976).

Separation of Copper, Lead, and Insol from Low-grade Molybdenite Concentrates, U.S. Patent 3,834,893 (1974).

Nitric Acid Process for Copper Recovery from Chalcopyrite Concentrates, U.S. Patent 3,793,429 (1972).