Patents by Inventor David F. Mitchell

David F. 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).

  • Patent number: 6344167
    Abstract: Superconductor containing filaments having embedments of superconducting material surrounded by a rayon matrix are formed by preparing a liquid suspension which contains at least 10 weight percent superconducting material; forming a multicomponent filament having a core of the suspension and a viscose sheath which contains cellulose xanthate; and thereafter, regenerating cellulose from the cellulose xanthate to form a rayon matrix.
    Type: Grant
    Filed: February 18, 1994
    Date of Patent: February 5, 2002
    Assignee: BASF Corporation
    Inventors: Olli P. Tuominen, Matthew B. Hoyt, David F. Mitchell, Carol W. Morgan, Clyde Gordon Roberts, Robert A. Tyler
  • Patent number: 5458663
    Abstract: Disclosed is an apparatus for removing emissions, originated in the manufacturing industry, especially from polymerization operations and thermoplastic polymer processing operations which has a duct system for collecting the air, containing emissions, with an entrance and an exit, a first heat exchanger, which is connected to the entrance of the duct system, a liquid removal system which is connected to the first heat exchanger, a second heat exchanger, which is connected to the liquid removal system and a fan which is connected to the second heat exchanger and the exit of the duct system.
    Type: Grant
    Filed: November 29, 1993
    Date of Patent: October 17, 1995
    Assignee: BASF Corporation
    Inventors: Beth O. Teague, David F. Mitchell, Joseph T. Flack, Dennis G. Shealy
  • Patent number: 5433769
    Abstract: Disclosed is a process for removing emissions, originated in the manufacturing industry, especially from polymerization operations and thermoplastic polymer processing operations which includes collecting the air, containing the emissions, directing the air, containing the emissions through a first heat exchanger thereby cooling the air, directing the air, exiting the first heat exchanger, through a second heat exchanger, thereby cooling the air, directing the air exiting the second heat exchanger to a liquid removal system and directing the air, exiting the liquid removal system through the first heat exchanger, thereby heating the air.
    Type: Grant
    Filed: November 29, 1993
    Date of Patent: July 18, 1995
    Assignee: BASF Corporation
    Inventors: Beth O. Teague, David F. Mitchell, Joseph T. Flack, Dennis G. Shealy
  • Patent number: 5433761
    Abstract: Disclosed is an apparatus for removing emissions, originated in the manufacturing industry, especially from polymerization operations and thermoplastic polymer processing operations which has a plurality of ducts, an entrance for collecting air, containing the emissions and an exit for exiting exhaust air, a first heat exchanger which has a hot side with an entrance and an exit and a cold side with an entrance and an exit, a second heat exchanger, which has a hot side with an entrance and an exit and a cold side, a liquid removal system, and a fan, whereby the first heat exchanger is connected with the entrance of the hot side to the entrance of the duct system and with the exit of the hot side to the entrance of the hot side of the second heat exchanger by a duct; the exit of the hot side of the second heat exchanger is connected to the entrance of the cool side of the first heat exchanger by a duct; the precipitator is connected to the exit of the cool side of the first heat exchanger by a duct and to the f
    Type: Grant
    Filed: November 29, 1993
    Date of Patent: July 18, 1995
    Assignee: BASF Corporation
    Inventors: Beth O. Teague, David F. Mitchell, Joseph T. Flack, Dennis G. Shealy
  • Patent number: 5431715
    Abstract: Disclosed is a process for removing emissions, originated in the manufacturing industry, especially from polymerization operations and thermoplastic polymer processing operations by collecting the air, containing the emissions, cooling the air, directing the air to a liquid removal system and heating the air.
    Type: Grant
    Filed: November 29, 1993
    Date of Patent: July 11, 1995
    Assignee: BASF Corporation
    Inventors: Beth O. Teague, David F. Mitchell, Joseph T. Flack, Dennis G. Shealy