Granted Patent
Utility
US 4,144,949 · App. 05/792,565
Bit positioning while drilling system
Inventor:
Daniel Silverman
Patented Case
View Patent ↗
Granted: Mar 20, 1979
Filed: May 2, 1977
Inventor
Daniel Silverman
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.