Patents Assigned to James G. O'Neill
  • Patent number: 4325237
    Abstract: A lock plug for use with a glad hand coupler of the air brake line of a tractor - trailer. The lock plug is insertable into and held in place locked within the air passage of the glad hand coupler to prevent unauthorized hookup of the plugged glad hand coupler with a mating glad hand coupler.
    Type: Grant
    Filed: September 8, 1980
    Date of Patent: April 20, 1982
    Assignee: James G. O'Neill
    Inventor: Larry L. Menzie