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).

  • Publication number: 20190263683
    Abstract: 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: Application
    Filed: May 13, 2019
    Publication date: August 29, 2019
    Inventor: Michael Donovan Mitchell
  • Patent number: 10336629
    Abstract: 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: Grant
    Filed: June 7, 2018
    Date of Patent: July 2, 2019
    Assignee: Helen of Troy Limited
    Inventor: Michael Donovan Mitchell
  • Publication number: 20180346351
    Abstract: 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: Application
    Filed: June 7, 2018
    Publication date: December 6, 2018
    Applicant: Helen of Troy Limited
    Inventor: Michael Donovan Mitchell
  • Patent number: 9994461
    Abstract: 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: Grant
    Filed: December 17, 2012
    Date of Patent: June 12, 2018
    Assignee: HELEN OF TROY LIMITED
    Inventor: Michael Donovan Mitchell
  • Publication number: 20170144132
    Abstract: 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: Application
    Filed: February 3, 2017
    Publication date: May 25, 2017
    Inventors: Andrew Thomas Pearks, Aloysius Ike Ononye, Michael Donovan Mitchell, Dimitris Ioannis Collias, David William Bjorkquist, Peter William Beerse
  • Publication number: 20140014566
    Abstract: 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: Application
    Filed: December 17, 2012
    Publication date: January 16, 2014
    Applicant: HELEN OF TROY LIMITED
    Inventor: Michael Donovan Mitchell
  • Patent number: 8333873
    Abstract: 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: Grant
    Filed: September 24, 2007
    Date of Patent: December 18, 2012
    Assignee: Pur Water Purification Products, Inc.
    Inventors: Mario Elmen Tremblay, Daniel F. Nesbitt, Dimitris Ioannis Collias, Michael Donovan Mitchell, Craig Merillat Rasmussen
  • Patent number: 8197790
    Abstract: 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: Grant
    Filed: April 13, 2009
    Date of Patent: June 12, 2012
    Assignee: PUR Water Purification Products, Inc.
    Inventors: Michael Donovan Mitchell, Dimitris Ioannis Collias
  • Patent number: 8119012
    Abstract: 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: Grant
    Filed: March 7, 2011
    Date of Patent: February 21, 2012
    Assignee: The Procter & Gamble Company
    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
  • Publication number: 20110155661
    Abstract: 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: Application
    Filed: March 7, 2011
    Publication date: June 30, 2011
    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
  • Publication number: 20110139701
    Abstract: 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: Application
    Filed: December 9, 2010
    Publication date: June 16, 2011
    Applicant: PUR WATER PURIFICATION PRODUCTS, INC.
    Inventors: Andrew Thomas Pearks, Aloysius Ike Ononye, Michael Donovan Mitchell, Dimitris Ioannis Collias, David William Bjorkquist, Peter William Beerse
  • Patent number: 7922008
    Abstract: 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: Grant
    Filed: July 10, 2009
    Date of Patent: April 12, 2011
    Assignee: The Procter & Gamble Company
    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
  • Patent number: 7896168
    Abstract: 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: Grant
    Filed: November 19, 2007
    Date of Patent: March 1, 2011
    Assignee: The Procter & Gamble Company
    Inventors: Dimitris Ioannis Collias, Stephen Allen Goldman, Michael Donovan Mitchell
  • Patent number: 7850859
    Abstract: 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: Grant
    Filed: May 13, 2009
    Date of Patent: December 14, 2010
    Assignee: The Procter & Gamble Company
    Inventors: John D. Tanner, David James Emmons, Richard P. Riedel, Michael Donovan Mitchell, Dimitris Ioannis Collias
  • Patent number: 7749394
    Abstract: 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: Grant
    Filed: May 13, 2009
    Date of Patent: July 6, 2010
    Assignee: The Procter & Gamble Company
    Inventors: Michael Donovan Mitchell, Dimitris Ioannis Collias, David William Bjorkquist, Piyush Narendra Zaveri, Matthew Morgan Woolley
  • Patent number: 7740766
    Abstract: 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: Grant
    Filed: May 13, 2009
    Date of Patent: June 22, 2010
    Assignee: The Procter & Gamble Company
    Inventors: Michael Donovan Mitchell, Dimitris Ioannis Collias, David William Bjorkquist, Piyush Narendra Zaveri, Matthew Morgan Woolley
  • Patent number: 7740765
    Abstract: 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: Grant
    Filed: May 13, 2009
    Date of Patent: June 22, 2010
    Assignee: The Procter & Gamble Company
    Inventors: Michael Donovan Mitchell, Dimitris Ioannis Collias, David William Bjorkquist, Piyush Narendra Zaveri, Matthew Morgan Woolley
  • Patent number: 7712613
    Abstract: 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: Grant
    Filed: September 16, 2008
    Date of Patent: May 11, 2010
    Assignee: 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
  • Publication number: 20100006508
    Abstract: 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: Application
    Filed: July 7, 2009
    Publication date: January 14, 2010
    Applicant: The Procter & Gamble Company
    Inventors: Michael Donovan Mitchell, Gary Echler
  • Publication number: 20100006507
    Abstract: 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: Application
    Filed: May 13, 2009
    Publication date: January 14, 2010
    Applicant: PUR WATER PURIFICATION PRODUCTS, INC.
    Inventors: John D. Tanner, David James Emmons, Richard P. Riedel, Michael Donovan Mitchell, Dimitris Ioannis Collias