Patents by Inventor Michel Pradervand

Michel Pradervand 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).

  • Center hole formation in an information storing disc
    Patent number: 3938810
    Abstract: A video disc having signal information stored in a spiral groove, has a center hole formed by creating a closed convolution of predetermined diameter concentrically to said spiral groove and removing the disc material within this closed convolution.
    Type: Grant
    Filed: March 12, 1973
    Date of Patent: February 17, 1976
    Assignee: RCA Corporation
    Inventor: Michel Pradervand