Patents by Inventor Jan Stelwagen

Jan Stelwagen 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).

  • Television camera tube having resilient gauze supporting structure
    Patent number: 4169986
    Abstract: If in a television camera tube the gauze-shaped electrode which is tensioned before the signal plate is assembled in a damped mass-spring system, in which the ratio of the mass of said system to the mass of the gauze should be larger than 30, while the fundamental frequency of the gauze and the natural frequency of the mass system differ less than 10% from each other and the damping of the mass spring system is so large that the time necessary for a decrease in amplitude of 20 db of the vibration of the mass of the mass spring system is smaller than 0.5 second, a tube is obtained having a low microphony.
    Type: Grant
    Filed: July 13, 1977
    Date of Patent: October 2, 1979
    Assignee: U.S. Philips Corporation
    Inventors: Jan Stelwagen, Alexius J. T. VAN Sambeeck