Patents by Inventor James D. Navratil

James D. Navratil 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).

  • Patent number: 5652190
    Abstract: Magnetic polymer resins capable of efficient removal of actinides and heavy metals from contaminated water are disclosed together with methods for making, using, and regenerating them. The resins comprise polyamine-epichlorohydrin resin beads with ferrites attached to the surfaces of the beads. Markedly improved water decontamination is demonstrated using these magnetic polymer resins of the invention in the presence of a magnetic field, as compared with water decontamination methods employing ordinary ion exchange resins or ferrites taken separately.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: July 29, 1997
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Robert L. Kochen, James D. Navratil
  • Patent number: 5595666
    Abstract: Magnetic polymer resins capable of efficient removal of actinides and heavy metals from contaminated water are disclosed together with methods for making, using, and regenerating them. The resins comprise polyamine-epichlorohydrin resin beads with ferrites attached to the surfaces of the beads. Markedly improved water decontamination is demonstrated using these magnetic polymer resins of the invention in the presence of a magnetic field, as compared with water decontamination methods employing ordinary ion exchange resins or ferrites taken separately.
    Type: Grant
    Filed: May 7, 1993
    Date of Patent: January 21, 1997
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Robert L. Kochen, James D. Navratil
  • Patent number: 5534363
    Abstract: An anode wick for use with electrochemical fuel cells, in accordance with the invention, establishes a physical connection between a fuel cell's anode membrane surface and a liquid water reservoir. Wicking action substantially ensures the cell's anode surface is continually bathed in water. Two mechanical check valves are incorporated to effectively prevent mixing of gaseous hydrogen and oxygen gases in the event the fuel cell system's water tanks become over pressurized. This design can effectively eliminate the need for some of a conventional fuel cell system's pumps and/or compressors. Advantageously, the invention also reduces the overall weight and mechanical complexity of the fuel cell system, thereby improving system reliability.
    Type: Grant
    Filed: March 22, 1994
    Date of Patent: July 9, 1996
    Assignee: Rockwell International Corporation
    Inventors: Kenneth M. Sprouse, James D. Navratil
  • Patent number: 4683124
    Abstract: Process for the removal of plutonium polymer and ionic actinides from aqueous solutions by absorption onto a solid extractant loaded on a solid inert support such as polystyrenedivinylbenzene. The absorbed actinides can then be recovered by incineration, by stripping with organic solvents, or by acid digestion. Preferred solid extractants are trioctylphosphine oxide and octylphenyl-N,N-diisobutylcarbamoylmethylphosphine oxide and the like.
    Type: Grant
    Filed: June 13, 1985
    Date of Patent: July 28, 1987
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Anthony C. Muscatello, James D. Navratil, Mark T. Saba