Patents by Inventor Manfred Czermak

Manfred Czermak 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).

  • Manufacture of flame-retardant regenerated cellulose fibres
    Patent number: 4063883
    Abstract: Manufacture of flame-retardant regenerated cellulose fibres by adding one or more flame-retardant phosphorus comounds to viscose, extruding the viscose-containing mixture thus obtained into a spinning bath, stretching and after treating the resulting filaments or staple fibres. The flame-retardant fibres are made by using as the flame-retardant agent a combination of compounds of the general formula:PN.sub.x O.sub.yin which x stands for a number between 0.09 and 1.7 and y stands for a number between 1.2 and 0, preferably approaching zero as the values of x increase towards 1.
    Type: Grant
    Filed: August 14, 1975
    Date of Patent: December 20, 1977
    Assignees: Hoechst Aktiengesellschaft, Chemiefaser Lenzing Aktiengesellschaft
    Inventors: Johann Hupfl, Manfred Czermak, Helmut Teichmann, Josef Paul