Granted Patent
Utility
US 4,194,577 · App. 05/842,565
Method and apparatus for completing a slanted wellbore
Inventor:
Roy R. Vann
Patented Case
View Patent ↗
Granted: Mar 25, 1980
Filed: Oct 17, 1977
Inventor
Roy R. Vann
Assignee (at issue)
Peabody Vann
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.