Patents Assigned to Roger P. Day
  • Direct current welding system
    Patent number: 5233159
    Abstract: A battery-powered welder delivers limited DC current to a workpiece without substantial reduction in applied voltage. The DC current is limited by utilizing a tungsten member in series between the battery and an arcing electrode. There is specifically disclosed a TIG welder embodiment.
    Type: Grant
    Filed: June 24, 1992
    Date of Patent: August 3, 1993
    Assignee: Roger P. Day
    Inventor: Roger P. Day