Patents Examined by Strecker Gerard R.
  • Resonant frequency measuring device for gauging coating thickness
    Patent number: 4005359
    Abstract: An electronic thickness gauge for measuring the coating thickness over magnetic and over conductive, non-magnetic substrates by measuring the movement of the low-frequency hump in the response curve for an over-coupled, double-tuned, open-faced transformer when the above-mentioned substrates are placed across the gap between the transformer pole-faces.
    Type: Grant
    Filed: November 7, 1975
    Date of Patent: January 25, 1977
    Inventor: William N. Smoot