Patents by Inventor Bruno Rybka

Bruno Rybka 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).

  • Disc-shaped information carrier having a high storage density
    Patent number: 4515843
    Abstract: A disc-shaped information carrier produced by thermoplastic deformation comprising a pressed mass including a co-polymer of vinyl chloride having additives incorporated therein. The carrier has hygroscopic properties and relief-like surface portions which are sufficiently yielding to permit pressure scanning.
    Type: Grant
    Filed: April 23, 1979
    Date of Patent: May 7, 1985
    Assignee: Teldec Telefunken-Decca Schallplatten GmbH
    Inventors: Heinz Borchard, Herbert Knothe, Bruno Rybka
  • Plastics foil for the manufacture of audio-visual information carriers
    Patent number: 4071490
    Abstract: A rigid polyvinyl chloride foil with modified impact resistance and free from plasticizer especially suitable for the manufacture of audio-visual information carriers with stamped spiral grooves from which the information is played back by pressure scanning. The foil is characterized by a special combination of properties such as flow, reduction in length, toughness, surface resistance, elasticity, peak-to-valley height and surface deposit.
    Type: Grant
    Filed: September 8, 1976
    Date of Patent: January 31, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hans-Joachim Andrascheck, Rainer Mucke, Werner Lorz, Heinz Borchard, Jurgen Buck, Herbert Knothe, Bruno Rybka
  • Method for producing a grinding foil
    Patent number: 3985521
    Abstract: A grinding foil which is to be used for grinding a record cutting or playback stylus is manufactured by providing a surface layer of a plastic foil with indentations for accommodating a grinding agent in granular form, filling the indentations with such grinding agent, and thermoplastically deforming the surface layer to smooth the foil surface and to bond the grinding agent into the surface layer.
    Type: Grant
    Filed: March 26, 1974
    Date of Patent: October 12, 1976
    Assignees: TED Bildplatten Aktiengesellschaft, AEG-Telefunken-Teldec
    Inventors: Heinz Borchard, Robert Kasch, Bruno Rybka, Herbert Knothe