Patents by Inventor Konrad Frigge

Konrad Frigge 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).

  • Process for the production of cellulose shaped bodies, bodies produced by this process and the use thereof
    Patent number: 6521169
    Abstract: Process for the production of cellulose shaped bodies through the precipitation of a cellulose solution containing cellulose dissolved in an amine oxide/water system in a precipitation bath, wherein the solution contains additional cellulose fibers.
    Type: Grant
    Filed: August 6, 1999
    Date of Patent: February 18, 2003
    Assignee: Fraunhofer-Gesellschaft zur Forderung der Angewandten Forschung e.V.
    Inventors: Peter Weigel, Hans-Peter Fink, Konrad Frigge
  • Method of making blown films of cellulose
    Patent number: 6113842
    Abstract: The invention is directed to a method of manufacturing oriented cellulose films by spinning non-derivated cellulose dissolved in amino oxides into a precipitating bath. The cellulose solution is extruded downward through a film-blowing nozzle and an external air gap into the precipitating bath. The spun cellulose film can be inflated after exiting the film-blowing nozzle.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: September 5, 2000
    Assignee: Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E. V.
    Inventors: Peter Weigel, Hans-Peters Fink, Konrad Frigge, Wolfgang Schwarz
  • Process for producing cellulose fibres
    Patent number: 6103162
    Abstract: The invention relates to a process for producing flexible cellulose fibres by spinning solutions of the cellulose through spinnerets over an air layer in an amine oxide-containing aqueous and/or alcoholic regenerating bath followed by drying, in which the damp threads from the spinneret are taken before drying through at least one post-treatment bath containing water and water-miscible alkanols, diols, triols or mixtures thereof, and a washing bath containing water, an alkanol, a diol or a triol.
    Type: Grant
    Filed: December 14, 1998
    Date of Patent: August 15, 2000
    Assignee: Fraunhofer-Gesellschaftzur Forderung der Angewandten Forschung e.V.
    Inventors: Konrad Frigge, Hans-Peter Fink, Peter Weigel, Ernst Walenta, Helmut Remde
  • Cellulosic molding process and cellulosic moldings
    Patent number: 5993710
    Abstract: The invention pertains to a process for manufacturing cellulose molded mers wherein a solution dissolved in amine oxides is shaped in a nozzle and the shaped solution is led after an air gap into a precipitation medium. The molded solution is passed successively through at least two precepitation media, which are selected so that a slower coagualation takes place at least in the first precipitation medium than the final precipitation medium.
    Type: Grant
    Filed: January 9, 1998
    Date of Patent: November 30, 1999
    Assignee: Fraunhofer-Gesellschaft zur Forderung der Angewandten Forschung e.V.
    Inventors: Peter Weigel, Hans-Peter Fink, Hans Joachim Purz, Konrad Frigge, Ulrich Wachsmann, Martin Nywalt
  • Process of making flexible cellulose fibers
    Patent number: 5618483
    Abstract: This invention relates to flexible cellulose fibers with a reduced modulus and a decreased NMR degree of order, particularly for use in the textile field, which are obtained by pressing out solutions of the cellulose in hydrous NMMNO through spinning nozzles along an air travel into an NMMNO-containing aqueous and/or alcoholic precipitation bath as well as by a conventional rinsing, aftertreatment and drying, with strengths of between 15 and 50 cN/tex, and to a process for their production. According to the invention, these flexible cellulose fibers have an initial modulus of less than 1,500 cN/tex, and the relationship of the heights of the lines at 88 ppm and 85 ppm above the spectrum base line in the highly resolved .sup.13 C-NMR solid-body spectrum is .ltoreq.1.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: April 8, 1997
    Assignee: Fraunhofer Gesellschaft Petentabteilung
    Inventors: Peter Weigel, Albrecht Bauer, Konrad Frigge, Jurgen Gensrich, Wolfgang Wagenknecht