Patents by Inventor Franz Ferdinand Rhiel

Franz Ferdinand Rhiel 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).

  • Method for controlling the process of separating mixtures containing several substances
    Patent number: 8078323
    Abstract: Method for controlling the process of separating mixtures containing several substances having close boiling points and with a known concentration, in a distillation column, wherein the concentration of at least one component is measured at a midpoint of the column, and said measurement, together with other parameters, is used to control the process.
    Type: Grant
    Filed: September 6, 2002
    Date of Patent: December 13, 2011
    Assignee: Bayer AG
    Inventors: Frank Meeuwssen, Franz Ferdinand Rhiel, Torsten Hauschild, Martin Gerlach
  • Process for producing oligocarbonates
    Patent number: 6835797
    Abstract: A continuous process for producing oligocarbonate is disclosed. The process entails in sequence the steps of a) reacting a dihydroxyaryl compound with a diaryl carbonate in the presence of a catalyst to obtain a melt and avoiding removal of released monohydroxyaryl compound and b) withdrawing the monohydroxyaryl compound by flash evaporation and c) heating the melt obtained under vacuum in an evaporator equipped with sump receiver and d) repeating at least once steps b) and then c) each at gradually increased temperatures and lowered pressures.
    Type: Grant
    Filed: March 22, 2002
    Date of Patent: December 28, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Uwe Hucks, Rolf Bachmann, Franz Ferdinand Rhiel, Thomas Fischer, Silke Kratschmer
  • Method for controlling the process of separating mixtures containing several substances
    Publication number: 20040249512
    Abstract: Method for controlling the process of separating mixtures containing several substances having close boiling points and with a known concentration, in a distillation column, wherein the concentration of at least one component is measured at a midpoint of the column, and said measurement, together with other parameters, is used to control the process.
    Type: Application
    Filed: March 18, 2004
    Publication date: December 9, 2004
    Inventors: Frank Meeuwssen, Franz Ferdinand Rhiel, Torsten Hauschild, Martin Gerlach
  • Process for producing oligocarbonates
    Publication number: 20020137874
    Abstract: A continuous process for producing oligocarbonate is disclosed. The process entails in sequence the steps of a) reacting a dihydroxyaryl compound with a diaryl carbonate in the presence of a catalyst to obtain a melt and avoiding removal of released monohydroxyaryl compound and b) withdrawing the monohydroxyaryl compound by flash evaporation and c) heating the melt obtained under vacuum in an evaporator equipped with sump receiver and d) repeating at least once steps b) and then c) each at gradually increased temperatures and lowered pressures.
    Type: Application
    Filed: March 22, 2002
    Publication date: September 26, 2002
    Inventors: Uwe Hucks, Rolf Bachmann, Franz Ferdinand Rhiel, Thomas Fischer, Silke Kratschmer
  • Two-step process for the production of thermoplastic polycarbonate
    Patent number: 5767224
    Abstract: The invention relates to a two-step melt process for the production of thermoplastic, solvent-free, low-branching polycarbonates with low --OH terminal group content using a self-cleaning high-viscosity reactor.
    Type: Grant
    Filed: March 24, 1997
    Date of Patent: June 16, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Steffen Kuhling, Klaus Schebesta, Uwe Hucks, Martin Ullrich, Heinrich Schuchardt, Rolf Bachmann, Thomas Fischer, Klemens Kohlgruber, Franz Ferdinand Rhiel, Gottfried Zaby
  • Process for the production of thermoplastic polycarbonate
    Patent number: 5652324
    Abstract: The invention relates to a transesterification process for the production of thermoplastic, solventless oligo-/polycarbonates in which aromatic diphenols and carbonic acid diaryl esters are combined and reacted in gaseous form.
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: July 29, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Uwe Hucks, Steffen Kuhling, Thomas Fischer, Gottfried Zaby, Franz Ferdinand Rhiel
  • Process for the manufacture of thermoplastic polycarbonate
    Patent number: 5648437
    Abstract: The present invention provides a melt process for the manufacture of thermoplastic solvent-free polycarbonates with the use of a continuously operated tubular reactor for monophenol vaporization.
    Type: Grant
    Filed: March 20, 1996
    Date of Patent: July 15, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Fischer, Rolf Bachmann, Uwe Hucks, Franz Ferdinand Rhiel, Steffen Kuhling