Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Rotary drill bit for use in drilling holes in subsurface earth formations

Rotary drill bit for use in drilling holes in subsurface earth formations

US Patent 4991670 · Granted Feb 12, 1991

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

PDC cutter with stress diffusing structures2014
Apparatus for high-throughput electroporation2010
Transfer and positioning apparatus for automated conveyor system2007
Specimen carrier transfer apparatus for a conveyor track2006
Cutting structure for rotary drill bits2000
Rotary drill bit having moveable formation-engaging members2000
Vertical card file2000
Vertical card file2000
Cutting structures for rotary drill bits1999
Storage shed lid1999
Hummingbird feeder1998
Drilling assembly for drilling holes in subsurface formations1998