Patents by Inventor Johannes Adolf Krassig

Johannes Adolf Krassig 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).

  • Production of flameproof fibers of regenerated cellulose
    Patent number: 3974251
    Abstract: Flame-retardant fibers of regenerated cellulose are produced by adding one or more flame-retardant phosphorus compounds to the viscose, extruding the viscose into a spinning bath and, if desired, stretching and after-treating the resulting filaments or staple fibers. The flame-retardant agent is a compound of the general formulaPN.sub.x O.sub.yin which x stands for a number between 0.9 and 1.7 and y stands for a number between 1.2 and 0, where the y-values converge towards zero as the x-values increase. The flame-retardant agent is more particularly used in a proportion approximately between 5 and 30 weight %, based on the weight of the cellulose.
    Type: Grant
    Filed: March 4, 1974
    Date of Patent: August 10, 1976
    Assignees: Hoechst Aktiengesellschaft, Chemiefaser Lenzing Aktiengesellschaft
    Inventors: Joseph Cremer, Heinz Harnisch, Johannes Adolf Krassig, Johannes Hupfl, Werner Gschaider