Granted Patent
Utility
US 5,086,851 · App. 07/604,784
Combination thrust and radial bearing for use in down-hole drilling tools
Inventor:
Thomas R. Beasley
Patented Case
View Patent ↗
Granted: Feb 11, 1992
Filed: Oct 26, 1990
Inventor
Thomas R. Beasley
Assignee (at issue)
Dailey Petroleum Services Corp.
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.