Patents by Inventor Johan C. J. A. Roozen

Johan C. J. A. Roozen 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).

  • Variable capacitor
    Patent number: 4193107
    Abstract: A variable capacitor comprising a lower plate and an upper plate which are made of a synthetic material which is suitable for ultrasonic welding, said plates being provided with a number of engaging spacer columns which are integral with the plates and which are connected to each other by ultrasonic welding.
    Type: Grant
    Filed: February 28, 1978
    Date of Patent: March 11, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Adrianus J. Wagemakers, Johan C. J. A. Roozen, Jozephus J. M. Smit