Patents Assigned to Thomas G. Wygant
  • Rotary drill bit
    Patent number: 4230193
    Abstract: An improved rotary drill bit comprised of two or more elongated generally cylindrical drill members the lower ends of which form a cutting face. Each of the drill members includes a plurality of vertically spaced rows of diamond-shaped openings disposed, or formed, in the sides, or wall, thereof, the openings in adjacent rows being offset from each other and overlapping at their upper and lower ends whereby as the lower ends of the drill member wear away, cutting edges are continuously formed thereon by the diamond-shaped openings.
    Type: Grant
    Filed: December 15, 1978
    Date of Patent: October 28, 1980
    Assignees: Arthur G. Burki, Thomas G. Wygant
    Inventor: Clifford K. Logan, Jr.