Patents by Inventor Werner Handl

Werner Handl 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).

  • Eraser and process for its manufacture
    Patent number: 4393022
    Abstract: An eraser based on polyvinyl chloride having particles of a crosslinked polymeric natural or synthetic rubber embedded in the polyvinyl chloride structure. Such erasers have high strength and good aging resistance. Additionally, conventional softeners in the eraser do not undergo significant migration and consequently, the eraser does not smudge. A process for manufacturing the eraser is also disclosed.
    Type: Grant
    Filed: November 6, 1981
    Date of Patent: July 12, 1983
    Assignee: J. S. Staedtler
    Inventor: Werner Handl
  • Eraser and process for its manufacture
    Patent number: 4335033
    Abstract: An eraser based on polyvinyl chloride having particles of a crosslinked polymeric natural or synthetic rubber embedded in the polyvinyl chloride structure. Such erasers have high strength and good aging resistance. Additionally, conventional softeners in the eraser do not undergo significant migration and consequently, the eraser does not smudge. A process for manufacturing the eraser is also disclosed.
    Type: Grant
    Filed: August 16, 1979
    Date of Patent: June 15, 1982
    Assignee: J. S. Staedtler
    Inventor: Werner Handl
  • Unburnt lead refill for writing and drawing pencils
    Patent number: 4023974
    Abstract: An unburnt lead refill for writing and drawing pencils, particularly for use on drawing cloth, consisting of dyestuff, lubricant, filling material, binding agent and, if required, wax. The binding agent is methyl cellulose and/or methyl hydroxy-ethyl cellulose and/or methyl hydroxy-propyl cellulose and/or hydroxy-ethyl cellulose which is/are dissolved in water and emulsified with an addition of benzyl alcohol, benzaldehyde or a mixture of benzyl alcohol and benzaldehyde.
    Type: Grant
    Filed: September 8, 1975
    Date of Patent: May 17, 1977
    Assignee: J. S. Staedtler
    Inventor: Werner Handl