Patents by Inventor Gunter Grottker

Gunter Grottker 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 recording provided with legible matter
    Patent number: 4066268
    Abstract: In the production of disc recordings, the label portion therefor is formed by tracing a pattern of essentially circular grooves or arrays of dots and groove or dot-free areas in the location of the label portion, the grooved areas contrasting visually with the groove-free areas and the pattern being such that one type of area, preferably the groove-free areas, forms the legible characters and patterns to appear in the label portion.
    Type: Grant
    Filed: February 10, 1975
    Date of Patent: January 3, 1978
    Assignee: TED Bildplatten Aktiengesellschaft AEG-Telefunken-Teldec
    Inventors: Heinz Borchard, Gunter Grottker, Peter Thun