Patents by Inventor Charles Andrew Keskimaki

Charles Andrew Keskimaki 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).

  • Method and apparatus for distinguishing stress wave emissions from mechanical noise
    Patent number: 4086816
    Abstract: Signals emanating from a weld are detected during the post weld period and excursions of the detected signal above a predetermined threshold are counted. Simultaneously, an envelope of the signal is developed and excursions thereof above the threshold are also counted. A ratio of the signal excursion count to the envelope excursion count is formed. The ratio so formed is compared to known ranges of ratio values to determine whether the detected signal is mechanical noise or a stress wave emission signal.
    Type: Grant
    Filed: June 22, 1977
    Date of Patent: May 2, 1978
    Assignee: Western Electric Co., Inc.
    Inventors: Min-Chung Jon, Charles Andrew Keskimaki, Sotirios John Vahaviolos
  • Method and apparatus for determining the acceptability of a weld formed by applying repetitive pulses of energy to the weld site
    Patent number: 4086817
    Abstract: Stress wave emission signals emanating from a weld during an AC welding operation are detected during (1) the time when the AC power is on, (2) the post weld time period, and (3) during each half-cycle of the AC weld when the absolute magnitude of the current is decaying. The stress wave emission signals are counted in each of these periods and compared to predetermined ranges of values to determine the acceptability of the weld.
    Type: Grant
    Filed: July 5, 1977
    Date of Patent: May 2, 1978
    Assignee: Western Electric Co., Inc.
    Inventors: Min-Chung Jon, Charles Andrew Keskimaki