Patents by Inventor Archibald Joseph McLean

Archibald Joseph McLean 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).

  • Patent number: 3975939
    Abstract: Methods of and apparatus for simulating ultrasonic pulse echoes are used to test and calibrate ultrasonic flaw detectors by simulating a train of radio frequency pulses, having a pulse repetition frequency which is indicative of both the speed of sound in a material under test and the thickness of that material. This is accomplished by generating a train of d.c. pulses having a pulse repetition frequency, which is directly proportional to and, which is a multiple of the speed of sound of the material The pulse repetition frequency is also inversely proportional to the thickness of the material. The d.c. pulses are used to drive a radio frequency pulse generator and a pulse modulator. The outputs of the radio frequency generator and pulse modulator are then combined to produce a signal having an amplitude envelope, which simulates a series of ultrasonic pulse echoes.
    Type: Grant
    Filed: July 2, 1975
    Date of Patent: August 24, 1976
    Inventor: Archibald Joseph McLean