Patents by Inventor Michael Donovan Mitchell
Michael Donovan Mitchell 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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Publication number: 20190263683Abstract: Embodiments of a gravity filter for potable water comprise a loose filter bed comprising ion exchange resin particles and activated carbon particles, and a porous non-woven filter substrate disposed downstream of the loose filter bed, wherein the porous non-woven filter substrate comprises an impregnated heavy metal scavenger.Type: ApplicationFiled: May 13, 2019Publication date: August 29, 2019Inventor: Michael Donovan Mitchell
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Patent number: 10336629Abstract: Embodiments of a gravity filter for potable water comprise a loose filter bed comprising ion exchange resin particles and activated carbon particles, and a porous non-woven filter substrate disposed downstream of the loose filter bed, wherein the porous non-woven filter substrate comprises an impregnated heavy metal scavenger.Type: GrantFiled: June 7, 2018Date of Patent: July 2, 2019Assignee: Helen of Troy LimitedInventor: Michael Donovan Mitchell
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Publication number: 20180346351Abstract: Embodiments of a gravity filter for potable water comprise a loose filter bed comprising ion exchange resin particles and activated carbon particles, and a porous non-woven filter substrate disposed downstream of the loose filter bed, wherein the porous non-woven filter substrate comprises an impregnated heavy metal scavenger.Type: ApplicationFiled: June 7, 2018Publication date: December 6, 2018Applicant: Helen of Troy LimitedInventor: Michael Donovan Mitchell
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Patent number: 9994461Abstract: Embodiments of a gravity filter for potable water comprise a loose filter bed comprising ion exchange resin particles and activated carbon particles, and a porous non-woven filter substrate disposed downstream of the loose filter bed, wherein the porous non-woven filter substrate comprises an impregnated heavy metal scavenger.Type: GrantFiled: December 17, 2012Date of Patent: June 12, 2018Assignee: HELEN OF TROY LIMITEDInventor: Michael Donovan Mitchell
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Publication number: 20170144132Abstract: Embodiments of systems and methods for producing a coated activated carbon comprise the steps of providing activated carbon particles having a particle size up to about 100 ?m, and coating the activated carbon particles by spraying droplets of a cationic polymer solution onto the surface of the activated carbon particles, wherein the cationic polymer solution comprises about 1% to about 15% by weight cationic polymer and the droplet size is between about 5 ?m to about 100 ?m.Type: ApplicationFiled: February 3, 2017Publication date: May 25, 2017Inventors: Andrew Thomas Pearks, Aloysius Ike Ononye, Michael Donovan Mitchell, Dimitris Ioannis Collias, David William Bjorkquist, Peter William Beerse
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Publication number: 20140014566Abstract: Embodiments of a gravity filter for potable water comprise a loose filter bed comprising ion exchange resin particles and activated carbon particles, and a porous non-woven filter substrate disposed downstream of the loose filter bed, wherein the porous non-woven filter substrate comprises an impregnated heavy metal scavenger.Type: ApplicationFiled: December 17, 2012Publication date: January 16, 2014Applicant: HELEN OF TROY LIMITEDInventor: Michael Donovan Mitchell
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Patent number: 8333873Abstract: A method for killing microorganisms in water, by passing an aqueous feed solution comprising of water containing some form of halide salt into a non-membrane electrolysis cell comprising an anode and a cathode, adjacent to the anode, while flowing electrical current between the anode and the cathode to electrolyze the aqueous feed solution and convert the halide salt to anti-microbial mixed oxidants.Type: GrantFiled: September 24, 2007Date of Patent: December 18, 2012Assignee: Pur Water Purification Products, Inc.Inventors: Mario Elmen Tremblay, Daniel F. Nesbitt, Dimitris Ioannis Collias, Michael Donovan Mitchell, Craig Merillat Rasmussen
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Patent number: 8197790Abstract: A method of making a filter material for producing potable water comprises providing activated carbon particles, depositing one or more nanofilament precursors at least partially onto the surface of the activated carbon particles, agitating the activated carbon particles and deposited nanofilament precursors in the presence of carbonaceous vapor, and heating the activated carbon particles and the deposited nanofilament precursors in the presence of carbonaceous vapor at a temperature and time sufficient to produce the filter material comprising activated carbon particles having carbon nanofilaments on the surface of the particles.Type: GrantFiled: April 13, 2009Date of Patent: June 12, 2012Assignee: PUR Water Purification Products, Inc.Inventors: Michael Donovan Mitchell, Dimitris Ioannis Collias
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Patent number: 8119012Abstract: A filter and filter material for providing or treating potable water is provided. The filter includes a housing having an inlet and an outlet, a filter material disposed within the housing, the filter material formed at least in part from a mixture of a plurality of mesoporous and microporous activated carbon particles. Preferably, at least some of the mesoporous activated carbon filter particles are coated with a cationic polymer, and even more preferably, at least some of the particles are coated with a cationic polymer and silver or a silver containing material. Kits comprising filters and information relating to the reduction, killing or removal of bacteria, viruses, microbials, and TTHM are also provided.Type: GrantFiled: March 7, 2011Date of Patent: February 21, 2012Assignee: The Procter & Gamble CompanyInventors: Jeannine Rebecca Bahm, Andrew Thomas Pearks, Guillermo Matias Vidal, Dimitris Ioannis Collias, Michael Donovan Mitchell, Robert E. Astle, Katharine L. K. Faye, Robert Andrew Governal, Thomas J. Hamlin, Rebecca A. Lucht, Hemang Patel
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Publication number: 20110155661Abstract: A filter and filter material for providing or treating potable water is provided. The filter includes a housing having an inlet and an outlet, a filter material disposed within the housing, the filter material formed at least in part from a mixture of a plurality of mesoporous and microporous activated carbon particles. Preferably, at least some of the mesoporous activated carbon filter particles are coated with a cationic polymer, and even more preferably, at least some of the particles are coated with a cationic polymer and silver or a silver containing material. Kits comprising filters and information relating to the reduction, killing or removal of bacteria, viruses, microbials, and TTHM are also provided.Type: ApplicationFiled: March 7, 2011Publication date: June 30, 2011Inventors: Jeannine Rebecca Bahm, Andrew Thomas Pearks, Guillermo Matias Vidal, Dimitris Ioannis Collias, Michael Donovan Mitchell, Robert E. Astle, Katharine L.K. Faye, Robert Andrew Governal, Thomas J. Hamlin, Rebecca A. Lucht, Hemang Patel
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Publication number: 20110139701Abstract: Embodiments of systems and methods for producing a coated activated carbon comprise the steps of providing activated carbon particles having a particle size up to about 100 ?m, and coating the activated carbon particles by spraying droplets of a cationic polymer solution onto the surface of the activated carbon particles, wherein the cationic polymer solution comprises about 1% to about 15% by weight cationic polymer and the droplet size is between about 5 ?m to about 100 ?m.Type: ApplicationFiled: December 9, 2010Publication date: June 16, 2011Applicant: PUR WATER PURIFICATION PRODUCTS, INC.Inventors: Andrew Thomas Pearks, Aloysius Ike Ononye, Michael Donovan Mitchell, Dimitris Ioannis Collias, David William Bjorkquist, Peter William Beerse
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Patent number: 7922008Abstract: A filter and filter material for providing or treating potable water is provided. The filter includes a housing having an inlet and an outlet, a filter material disposed within the housing, the filter material formed at least in part from a mixture of a plurality of mesoporous and microporous activated carbon particles. Preferably, at least some of the mesoporous activated carbon filter particles are coated with a cationic polymer, and even more preferably, at least some of the particles are coated with a cationic polymer and silver or a silver containing material. Kits comprising filters and information relating to the reduction, killing or removal of bacteria, viruses, microbials, and TTHM are also provided.Type: GrantFiled: July 10, 2009Date of Patent: April 12, 2011Assignee: The Procter & Gamble CompanyInventors: Jeannine Rebecca Bahm, Andrew Thomas Pearks, Guillermo Matias Vidal, Dimitris Ioannis Collias, Michael Donovan Mitchell, Robert E. Astle, Katharine L. K. Faye, Robert Andrew Governal, Thomas J. Hamlin, Rebecca A. Lucht, Hemang Patel
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Patent number: 7896168Abstract: A filter block may comprise activated carbon filter particles without metallic biocides. The activated carbon filter particles may have a median particle size of less than or equal to about 90 microns and having a particle span of less than or equal to about 1.7. The filter block may have a permeability of greater than about 3.0×10?9 cm2 and a Filter Viruses Log Removal of greater than about 2 logs. A portion of the activated carbon filter particles may be coated with a cationic polymer. Another filter block may comprise mesoporous activated carbon filter particles without metallic biocides, wherein the mesoporous activated carbon filter particles may have a median particle size of less than or equal to about 104 ?m and a particle span of less than or equal to about 2.05, and wherein at least a portion of the filter particles may be coated with a cationic polymer. The filter block may have a permeability of greater than about 2.0×10?9 cm2 and a Filter Viruses Log Removal of greater than about 2 logs.Type: GrantFiled: November 19, 2007Date of Patent: March 1, 2011Assignee: The Procter & Gamble CompanyInventors: Dimitris Ioannis Collias, Stephen Allen Goldman, Michael Donovan Mitchell
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Patent number: 7850859Abstract: A method of treating low-pressure untreated drinking water includes providing a low-pressure water filter device, running low-pressure untreated drinking water from a source of low-pressure untreated drinking water through a low-pressure water filter of the low-pressure water filter device, removing bacteria and viruses from the low pressure untreated drinking water at a level of Filter Bacteria Log Removal of greater than about 2 logs and a Filter Viruses Log Removal of greater than about 1 log, and filling a storage housing with treated drinking water at greater than about 5 mL/min. The low-pressure water filter device may include a connector for connecting to an untreated drinking water source, a low-pressure water filter comprising mesoporous activated carbon particles and a storage housing. The average fluid contact time with the low-pressure water filter may be greater than about 2 seconds.Type: GrantFiled: May 13, 2009Date of Patent: December 14, 2010Assignee: The Procter & Gamble CompanyInventors: John D. Tanner, David James Emmons, Richard P. Riedel, Michael Donovan Mitchell, Dimitris Ioannis Collias
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Patent number: 7749394Abstract: Disclosed is a method of providing potable water that includes providing a filter, passing water through the filter, and removing bacteria and viruses from the water with the filter. The filter comprises a housing having an inlet and an outlet and a filter material disposed within the housing, the filter material formed at least in part from a plurality of filter particles consisting of mesoporous activated carbon wherein at least a portion of the plurality of filter particles is at least partially coated with silver or a silver-containing material. A sum of mesopore and macropore volumes of the filter particles may be between about 0.2 mL/g and about 2 mL/g, wherein mesopore means an intra-particle pore having a diameter between 2 nm and 50 nm, and macropore means an intra-particle pore having a diameter greater than 50 nm, a total pore volume of the filter particles is greater than about 0.Type: GrantFiled: May 13, 2009Date of Patent: July 6, 2010Assignee: The Procter & Gamble CompanyInventors: Michael Donovan Mitchell, Dimitris Ioannis Collias, David William Bjorkquist, Piyush Narendra Zaveri, Matthew Morgan Woolley
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Patent number: 7740766Abstract: Disclosed is a method of providing potable water that includes providing a filter, passing water through the filter, and removing bacteria and viruses from the water with the filter. The filter comprises a housing having an inlet and an outlet and a filter material disposed within the housing, the filter material formed at least in part from a plurality of mesoporous wood activated carbon filter particles and particles selected from the group consisting of mesoporous wood activated carbon filter particles coated entirely with a cationic polymer, mesoporous wood activated carbon filter particles partially coated with a cationic polymer, and mixtures thereof. A sum of mesopore and macropore volumes of the filter particles may be between about 0.2 mL/g and about 2 mL/g, wherein mesopore means an intra-particle pore having a diameter between 2 nm and 50 nm, and macropore means an intra-particle pore having a diameter greater than 50 nm, a total pore volume of the filter particles is greater than about 0.Type: GrantFiled: May 13, 2009Date of Patent: June 22, 2010Assignee: The Procter & Gamble CompanyInventors: Michael Donovan Mitchell, Dimitris Ioannis Collias, David William Bjorkquist, Piyush Narendra Zaveri, Matthew Morgan Woolley
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Patent number: 7740765Abstract: Disclosed is a method of providing potable water that includes providing a filter, passing water through the filter, and removing bacteria and viruses from the water with the filter. The filter comprises a housing having an inlet and an outlet and a filter material disposed within the housing, the filter material formed at least in part from a plurality of filter particles consisting of mesoporous activated carbon. A sum of mesopore and macropore volumes of the filter particles may be between about 0.2 mL/g and about 2 mL/g, wherein mesopore means an intra-particle pore having a diameter between 2 nm and 50 nm, and macropore means an intra-particle pore having a diameter greater than 50 nm, a total pore volume of the filter particles is greater than about 0.4 mL/g and less than about 3 mL/g, and a ratio of the sum of the mesopore and macropore volumes to the total pore volume of the filter particles is greater than about 0.3.Type: GrantFiled: May 13, 2009Date of Patent: June 22, 2010Assignee: The Procter & Gamble CompanyInventors: Michael Donovan Mitchell, Dimitris Ioannis Collias, David William Bjorkquist, Piyush Narendra Zaveri, Matthew Morgan Woolley
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Patent number: 7712613Abstract: A filter and filter material for providing or treating potable water is provided. The filter includes a housing having an inlet and an outlet, a filter material disposed within the housing, the filter material formed at least in part from a mixture of a plurality of mesoporous and microporous activated carbon particles. Preferably, at least some of the mesoporous activated carbon filter particles are coated with a cationic polymer, and even more preferably, at least some of the particles are coated with a cationic polymer and silver or a silver containing material. Kits comprising filters and information relating to the reduction, killing or removal of bacteria, viruses, microbials, and TTHM are also provided.Type: GrantFiled: September 16, 2008Date of Patent: May 11, 2010Assignee: PUR Water Purification Products, Inc.Inventors: Jeannine Rebecca Bahm, Andrew Thomas Pearks, Guillermo Matias Vidal, Dimitris Ioannis Collias, Michael Donovan Mitchell, Robert E. Astle, Katharine L. K. Faye, Robert Andrew Governal, Thomas J. Hamlin, Rebecca A. Lucht, Hemang Patel
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Publication number: 20100006508Abstract: Water filters and methods of filtering fluids (e.g., water) to produce treated water such as potable water. Specifically, water filters comprising activated carbon, fiber composites, or combinations thereof that are operable to remove heavy metals and/or viruses from fluids to produce potable water. The water filters may comprise at least one carbon filter comprising activated carbon particles, and at least one fiber composite filter comprising electropositive metallic fibers having dimensions of between 5 nm and 100 nm. The fiber composite filter may be disposed upstream of the carbon filter, downstream of the carbon filter, or both.Type: ApplicationFiled: July 7, 2009Publication date: January 14, 2010Applicant: The Procter & Gamble CompanyInventors: Michael Donovan Mitchell, Gary Echler
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Publication number: 20100006507Abstract: A method of treating low-pressure untreated drinking water includes providing a low-pressure water filter device, running low-pressure untreated drinking water from a source of low-pressure untreated drinking water through a low-pressure water filter of the low-pressure water filter device, removing bacteria and viruses from the low pressure untreated drinking water at a level of Filter Bacteria Log Removal of greater than about 2 logs and a Filter Viruses Log Removal of greater than about 1 log, and filling a storage housing with treated drinking water at greater than about 5 mL/min. The low-pressure water filter device may include a connector for connecting to an untreated drinking water source, a low-pressure water filter comprising mesoporous activated carbon particles and a storage housing. The average fluid contact time with the low-pressure water filter may be greater than about 2 seconds.Type: ApplicationFiled: May 13, 2009Publication date: January 14, 2010Applicant: PUR WATER PURIFICATION PRODUCTS, INC.Inventors: John D. Tanner, David James Emmons, Richard P. Riedel, Michael Donovan Mitchell, Dimitris Ioannis Collias