Patents by Inventor Richard Wirkkanen

Richard Wirkkanen 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).

  • Digital circuit failure detector
    Patent number: 4001818
    Abstract: A device for detecting the existence and location of failures on circuit boards is disclosed. The device is specially adapted for use with boards having a number of serially connected digital loops. Digital circuitry is provided which simultaneously compares a number of checkpoints on the faulty board with corresponding points on a known good board, and the first point to fail is isolated. Inhibit circuitry prevents failure indications at checkpoints if those failures occur subsequent to the first failure.
    Type: Grant
    Filed: October 22, 1975
    Date of Patent: January 4, 1977
    Assignee: Storage Technology Corporation
    Inventors: Frank Radichel, Richard Wirkkanen