Harold Koehler
Engineers at Sharman Pl, Sawyer, IA
License number
Colorado 9665
Issued Date
Aug 16, 1969
Renew Date
Jan 20, 1989
Expiration Date
Jan 20, 1989
Type
Professional Engineer
Address
Address
10 Sharman Pl, Sawyer, IA 52627
Professional information
Catalytic Hydrogen Reduction Of Metals From Solutions
US Patent:
3989509, Nov 2, 1976
Filed:
Nov 19, 1975
Appl. No.:
5/633236
Inventors:
Eddie C. Chou - Arvada CO
Ranko P. Crnojevich - Gretna LA
Harold Koehler - Fort Madison IA
Ranko P. Crnojevich - Gretna LA
Harold Koehler - Fort Madison IA
Assignee:
Amax Inc. - Greenwich CT
International Classification:
C22B 1512, C22B 2304
US Classification:
75 5A
Abstract:
An improved method is provided for efficiently precipitating metal powder selected from the group consisting of nickel, cobalt and copper from aqueous solutions using sulfur-free hydrogen at elevated pressure and temperature, the improvement residing in adding to the solution a small but effective amount of a catalyst as an anti-plating agent, said catalyst comprising an alkali metal or ammonium salt of a copolymer of maleic acid anhydride and an unsaturated branched chain aliphatic olefinic hydrocarbon containing 4 to 10 carbon atoms.