Patents by Inventor Rodney H. Sergent
Rodney H. Sergent 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).
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Patent number: 6165343Abstract: The present invention provides a process for generating an aqueous solution containing at least one active bromine compound comprising the steps of: electrolyzing an aqueous solution containing bromide ions until bromate ions are formed in said aqueous solution; and introducing to the aqueous solution containing bromate ions an acid to generate an aqueous solution containing at least one active bromine compound. The present invention also provides an apparatus for generating an aqueous solution containing at least one active bromine compound. The aqueous solution containing the active bromine compound(s) generated using the process and apparatus of the present invention may be used for water treatment and the recovery of precious metals such as gold.Type: GrantFiled: February 9, 1999Date of Patent: December 26, 2000Assignee: Elcat, Inc.Inventors: David B. Blum, Rodney H. Sergent, Vadim Zolotarsky
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Patent number: 5888428Abstract: Methods and compositions for generating stable, residual disinfectants during the ozonization of water, comprising the carrying out the ozonization of water in the presence of bromide ions and an effective amount of a hypobromite ion scavenger possessing imide and/or amide functionality that preferentially converts hypobromite ions to biocidal, ozone-stable derivatives thereof to thereby suppress the catalytic decomposition reaction of ozone with hypobromite ions. The methods and compositions of the present invention are useful for water disinfection and algae control, generally.Type: GrantFiled: September 30, 1996Date of Patent: March 30, 1999Assignee: Great Lakes Chemical CorporationInventors: Jonathan N. Howarth, Julie A. McKeown, Rodney H. Sergent
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Patent number: 5868911Abstract: The present invention provides a process for generating an aqueous solution containing at least one active bromine compound comprising the steps of: electrolyzing an aqueous solution containing bromide ions until bromate ions are formed in said aqueous solution; and introducing to the aqueous solution containing bromate ions an acid to generate an aqueous solution containing at least one active bromine compound. The present invention also provides an apparatus for generating an aqueous solution containing at least one active bromine compound. The aqueous solution containing the active bromine compound(s) generated using the process and apparatus of the present invention may be used for water treatment and the recovery of precious metals such as gold.Type: GrantFiled: June 12, 1997Date of Patent: February 9, 1999Assignee: Elcat, Inc.Inventors: David B. Blum, Rodney H. Sergent, Vadim Zolotarsky
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Patent number: 5679239Abstract: The present invention provides a process for generating an aqueous solution containing at least one active bromine compound comprising the steps of: electrolyzing an aqueous solution containing bromide ions so that bromate ions are formed in said aqueous solution; and introducing to the aqueous solution containing bromate ions an acid to generate an aqueous solution containing at least one active bromine compound. The present invention also provides an apparatus for generating an aqueous solution containing at least one active bromine compound. The aqueous solution containing the active bromine compound(s) generated using the process and apparatus of the present invention may be used for water treatment and the recovery of precious metals such as gold.Type: GrantFiled: October 8, 1996Date of Patent: October 21, 1997Assignee: Electrocatalytic, Inc.Inventors: David B. Blum, Rodney H. Sergent, Vadim Zolotarsky
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Patent number: 5620585Abstract: A process for leaching gold, silver, platinum and palladium wherein an aqueous leaching solution containing bromine and bromide ion contacts a precious metal source to produce an aqueous leachate. A precursor composition for producing an aqueous leaching solution for leaching gold, silver, platinum and palladium. A process for electrogenerating bromine and a process for leaching gold, silver, platinum and palladium wherein bromine is electrogenerated and contacts a precious metal source to produce an aqueous leachate. A process for leaching gold, silver, platinum and palladium wherein bromine is electrogenerated from a solution containing chloride ions and bromide ions.Type: GrantFiled: June 6, 1995Date of Patent: April 15, 1997Assignee: Great Lakes Chemical CorporationInventors: Ahmad Dadgar, Jonathan N. Howarth, Rodney H. Sergent, Nicolai A. Favstritsky, Julie A. McKeown, Dennis W. Borden, Brent M. Sanders, Jane Likens
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Patent number: 5607619Abstract: A process for leaching gold, silver, platinum and palladium wherein an aqueous leaching solution containing bromine and bromide ion contacts a precious metal source to produce an aqueous leachate. A precursor composition for producing an aqueous leaching solution for leaching gold, silver, platinum and palladium. A process for electrogenerating bromine and a process for leaching gold, silver, platinum and palladium wherein bromine is electrogenerated and contacts a precious metal source to produce an aqueous leachate. A process for leaching gold, silver, platinum and palladium wherein bromine is electrogenerated from a solution containing chloride ions and bromide ions.Type: GrantFiled: June 7, 1995Date of Patent: March 4, 1997Assignee: Great Lakes Chemical CorporationInventors: Ahmad Dadgar, Jonathan N. Howarth, Rodney H. Sergent, Nicolai A. Favstritsky, Julie A. McKeown, Dennis W. Borden, Brent M. Sanders, Jane Likens
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Patent number: 5385650Abstract: A process for recovering bromine from an acidic solution containing bromide ion. Electric current is passed through the acidic solution between an anode and a cathode, thereby generating bromine by electrolysis at the anode to produce an electrolyzate containing bromine. Bromine is separated from the electrolyzate as a vapor under negative pressure. The bromide ion solution may be contaminated with organic material. An electrolytic process for producing a hypobromous acid solution. An electrolytic cell.Type: GrantFiled: April 30, 1993Date of Patent: January 31, 1995Assignee: Great Lakes Chemical CorporationInventors: Jonathan N. Howarth, Ahmad Dadgar, Rodney H. Sergent
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Patent number: 5264136Abstract: Methods and compositions for generating stable, residual disinfectants during the ozonization of water, comprising the carrying out the ozonization of water in the presence of bromide ions and an effective amount of a hypobromite ion scavenger possessing imide and/or amide functionality that preferentially converts hypobromite ions to biocidal, ozone-stable derivatives thereof to thereby suppress the catalytic decomposition reaction of ozone with hypobromite ions. The methods and compositions of the present invention are useful for water disinfection and algae control, generally.Type: GrantFiled: October 30, 1992Date of Patent: November 23, 1993Assignee: Great Lakes Chemical CorporationInventors: Jonathan N. Howarth, Ahmad Dadgar, Julie A. McKeown, Rodney H. Sergent
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Patent number: 4637865Abstract: A process for extracting a precious metal or base metal from a source material containing the metal. The process comprises contacting the source material with an aqueous leaching solution containing a leaching agent comprising an N-halohydantoin compound, thereby producing an aqueous leachate containing said metal. Aqueous leaching compositions, and novel electrowinning and other electrodeposition processes are also disclosed.Type: GrantFiled: August 16, 1985Date of Patent: January 20, 1987Assignee: Great Lakes Chemical CorporationInventors: Rodney H. Sergent, Kenneth N. Thanstrom