Granted Patent
Utility
US 5,449,048 · App. 08/312,260
Drill bit having chip breaker polycrystalline diamond compact and hard metal insert at gauge surface
Inventors:
Gary M. Thigpen, William H. Sherwood, Jr., Coy M. Fielder
Patented Case
View Patent ↗
Granted: Sep 12, 1995
Filed: Sep 26, 1994
Inventors
Gary M. Thigpen
William H. Sherwood, Jr.
Coy M. Fielder
Assignee (at issue)
Baroid Technology, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.