Granted Patent
Utility
US 5,884,716 · App. 08/731,550
Constant bottom contact thruster
Inventor:
Thomas R. Beasley
Patented Case
View Patent ↗
Granted: Mar 23, 1999
Filed: Oct 16, 1996
Inventor
Thomas R. Beasley
Assignee (at issue)
Dailey Petroleum 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.