Patents by Inventor Ruediger J. Erckel

Ruediger J. Erckel 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).

  • Polymers prepared from 4,4'-bis(2-[3,4(dicarboxyphenyl)hexafluoroisopropyl] diphenyl ether dianhydride
    Patent number: 5055550
    Abstract: This invention relates to new fluorine-containing polyimides, polyamide-acids/esters, polyamides, addition polyimides and imide oligomers which exhibit low melting points, better solubilities, low dielectric constants, superior thermal and thermal oxidative stability, and improved processing characteristics.The products of this invention are characterized by the fact that they are derived from 4,4'-bis[2-(3,4-(dicarboxyphenyl)hexafluoroisopropyl]diphenyl ether dianhydride.
    Type: Grant
    Filed: March 21, 1990
    Date of Patent: October 8, 1991
    Assignee: Hoechst Celanese Corp.
    Inventors: Werner H. Mueller, Dinesh N. Khanna, Rohitkumar H. Vora, Ruediger J. Erckel
  • Polymers prepared from 4,4'-bis[2-(amino (halo) phenoxyphenyl) hexafluoroisopropyl]diphenyl ether
    Patent number: 5037949
    Abstract: This invention relates to new fluorine-containing polyimides, polyamide-acids/esters, polyamides, addition polyimides and imide oligomers which exhibit low melting points, better solubilities, low dielectric constants, superior thermal and thermal oxidative stability, and improved processing characteristics.The products of this invention are characterized by the fact that they are derived from 4,4'-bis[2-(amino(halo)phenoxyphenyl)hexafluoroisopropyl]diphenyl ether.
    Type: Grant
    Filed: March 6, 1990
    Date of Patent: August 6, 1991
    Assignee: Hoechst Celanese Corp.
    Inventors: Werner H. Mueller, Dinesh N. Khanna, Rohitkumar H. Vora, Ruediger J. Erckel
  • Polymers prepared from 4,4'-bis[2-(3,4-(dicarboxyphenyl)hexafluoroisopropyl] diphenyl ether dianhydride
    Patent number: 4931540
    Abstract: This invention relates to new fluorine-containing polyimides, polyamide-acids/esters, polyamides, addition polyimides and imide oligomers which exhibit low melting points, better solubilities, low dielectric constants, superior thermal and thermal oxidative stability, and improved processing characteristics.The products of this invention are characterized by the fact that they are derived from 4,4'-bis[2-(3,4-(dicarboxyphenyl)hexafluoroisopropyl]diphenyl ether dianhydride.
    Type: Grant
    Filed: November 24, 1987
    Date of Patent: June 5, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Werner H. Mueller, Dinesh N. Khanna, Rohitkumar H. Vora, Ruediger J. Erckel
  • Polymers prepared from 4,4'-bis(2-(amino(halo) phenoxyphenyl) hexafluoroisopropyl) diphenyl ether
    Patent number: 4925915
    Abstract: This invention relates to new fluorine-containing polyimides, polyamide-acids/esters, polyamides, addition polyimides and imide oligomers which exhibit low melting points, better solubilities, low dielectric constants, superior thermal and thermal oxidative stability, and improved processing characteristics.The product of this invention are characterized by the fact that they are derived from 4,4'-bis[2-(amino(halo)phenoxyphenyl)-hexafluoroisopropyl]diphenyl ether.
    Type: Grant
    Filed: November 24, 1987
    Date of Patent: May 15, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Werner H. Mueller, Dinesh N. Khanna, Rohitkumar H. Vora, Ruediger J. Erckel