1
Richard L Bain, John R Larson, Dennis D Gertenbach, Daniel W Gillespie, Joseph J Leto: Viscosity reduction processing at elevated pressure. Resource Technology Associates, Sheridan Ross & McIntosh, October 18, 1988: US04778586 (118 worldwide citation)

A method is disclosed for improving the transportability of a hydrocarbon composition by passing an influent feed stream of composition into a downcomer to provide a hydrostatic column of fluid. The influent stream is heated by heat exchange with an effluent product stream wherein at least one of th ...


2
Joseph J Leto, Dennis D Gertenbach, Daniel W Gillespie: Separation of hydrocarbons from tar sands froth. Resource Technology Associates, Sheridan Ross & McIntosh, March 10, 1987: US04648964 (24 worldwide citation)

A process suitable for separating the hydrocarbon fraction from a tar sands froth is provided. The process comprises heating a fluid stream comprising the froth to above about 300.degree. C., pressurizing the stream to above about 1000 psig and separating the hydrocarbon fraction, having less than 1 ...


3
James D Gillaspie, David R Baughman, Dennis D Gertenbach, Wayne W Hazen, George Owusu, John C Wilmot: Silica removal from pregnant leach solutions. Freeport McMoran Corporation, Snell & Wilmer L, April 6, 2010: US07691347 (2 worldwide citation)

The present invention relates generally to a process for removing dissolved or colloidal silica from a pregnant leach solution (“PLS”). More particularly, an exemplary embodiment of the present invention relates to a process which mixes PLS with an acid source, preferably lean electrolyte, to induce ...


4
Randall J Daughenbaugh, David T Bailey, William R Gamble, Dennis D Gertenbach: Process for removing impurities from natural product extracts. Hauser, Steven C Petersen, Sarah S O Rourke, Hogan & Hartson, October 17, 2000: US06132726 (2 worldwide citation)

In general the present invention relates to a process for the removal of undesireable compounds or residues from an extract which are more polar or less polar than the desired target compound. The preferred embodiment of the present invention is a three step process and is described in detail below. ...


5
Joanna M Robertson, Thomas R Bolles, Dennis D Gertenbach: Systems and methods for improved metal recovery using ammonia leaching. FREEPORT MINERALS CORPORATION, Snell & Wilmer L, November 17, 2015: US09187803 (1 worldwide citation)

Systems and methods for basic leaching are provided. In various embodiments, a method is provided comprising leaching a slurry comprising a copper bearing material and an ammonia leach medium, adding copper powder to the slurry, separating the slurry into a pregnant leach solution and solids, and pe ...


6
James D Gillaspie, David R Baughman, Dennis D Gertenbach, Wayne W Hazen, George Owusu, John C Wilmot: Silica removal from pregnant leach solutions. Freeport McMoran Corporation, Snell & Wilmer L, August 13, 2013: US08506673

The present invention relates generally to a process for removing dissolved or colloidal silica from a pregnant leach solution (“PLS”). More particularly, an exemplary embodiment of the present invention relates to a, process which mixes PLS with an acid source, preferably lean electrolyte, to induc ...


7
Joanna M Robertson, Thomas R Bolles, Dennis D Gertenbach: Systems and methods for improved metal recovery using ammonia leaching. FREEPORT MINERALS CORPORATION, Snell & Wilmer L, June 26, 2018: US10006133

Systems and methods for basic leaching are provided. In various embodiments, a method is provided comprising leaching a slurry comprising a copper bearing material and an ammonia leach medium, adding copper powder to the slurry, separating the slurry into a pregnant leach solution and solids, and pe ...


8
Joanna M Robertson, Thomas R Bolles, Dennis D Gertenbach: Systems and methods for improved metal recovery using ammonia leaching. FREEPORT MINERALS CORPORATION, Snell & Wilmer L, November 3, 2015: US09175366

Systems and methods for basic leaching are provided. In various embodiments, a method is provided comprising leaching a slurry comprising a copper bearing material and a leach medium comprising ammonia and ammonium carbonate, adding copper powder to the slurry, separating the slurry into a pregnant ...


9
James D Gillaspie, David R Baughman, Dennis D Gertenbach, Wayne W Hazen, George Owusu, John C Wilmot: Silica removal from pregnant leach solutions. Freepoint McMoran Corporation, Snell & Wilmer L, February 14, 2012: US08114365

The present invention relates generally to a process for removing dissolved or colloidal silica from a pregnant leach solution (“PLS”). More particularly, an exemplary embodiment of the present invention relates to a process which mixes PLS with an acid source, preferably lean electrolyte, to induce ...


10
James D Gillaspie, David R Baughman, Dennis D Gertenbach, Wayne W Hazen, George Owusu, John C Wilmot: Silica removal from pregnant leach solutions. Freeport Mcmoran Corporation, Snell & Wilmer, January 6, 2011: US20110000337-A1

The present invention relates generally to a process for removing dissolved or colloidal silica from a pregnant leach solution (“PLS”). More particularly, an exemplary embodiment of the present invention relates to a process which mixes PLS with an acid source, preferably lean electrolyte, to induce ...