Patents by Inventor Clifford D. Martin

Clifford D. Martin 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).

  • Arc welding instruction monitor
    Patent number: 4677277
    Abstract: A monitor designed to aid in the instruction of electric arc welding. The device is electrically isolated from the welder arc voltage by an optical coupling device which provides an isolated output signal linearly proportional to either arc voltage or arc current. Audio alarms are triggered when the arc voltage is either too high or too low indicating arc lengths that are too low indicating arc lengths that are too long or too short to provide acceptable weld quality. A self test switch is included to demonstrate the upper and lower voltage alarm operation.
    Type: Grant
    Filed: November 8, 1985
    Date of Patent: June 30, 1987
    Inventors: Marvin D. Cook, Clifford D. Martin