Patents by Inventor Walter Hofmann

Walter Hofmann 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).

  • Device for applying uniform traffic lines
    Patent number: 4460127
    Abstract: A device for obtaining a uniform application of marking material on streets, squares, or the like and, in particular, a marking machine with travel dependent driven, statically-operating pump system for the marking material, is provided. The device prevents the occurrence of substantial pressure fluctuations with respect to the given system pressure during opening and closing of an applicator nozzle and serves to influence the feeding flow to the nozzle.
    Type: Grant
    Filed: June 15, 1981
    Date of Patent: July 17, 1984
    Assignee: Walter Hofmann Maschinenfabrik
    Inventor: Walter Hofmann
  • Device for lateral limiting traffic marking lines
    Patent number: 4053108
    Abstract: An apparatus for applying road marking lines to a roadway which includes a pair of spaced plates movable with the apparatus to guide the line width. The spaced plates are also provided with a gas outlet opening to guide the marking material away from the plates onto the roadway to be marked.
    Type: Grant
    Filed: October 7, 1976
    Date of Patent: October 11, 1977
    Inventor: Walter Hofmann
  • Highly elastic synthetic crimp yarn with low residual latent crimp and process for producing said yarn
    Patent number: 3995420
    Abstract: The invention relates to a process for the production of a false-twist textured, highly elastic, synthetic crimp yarn with low residual shrinkage and latently bound crimp by stretching, false-twisting, heat-fixing and thermal after-treatment of the synthetic yarn at yarn draw-off rates of from 400 to 900 m/min, in which the thread tension during thermal after-treatment is 6-25% of the thread tension during heat-fixing, the time of thermal after-treatment is 2-5% of the time spent in heat-fixing and the temperature of the yarn during the thermal after-treatment is 30.degree.-100.degree. C.
    Type: Grant
    Filed: October 15, 1974
    Date of Patent: December 7, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Helmut Ohse, Wolfgang Muller, Walter Hofmann, Jurgen Walther