Granted Patent
Utility
US 4,269,278 · App. 06/110,507
Method and apparatus for completing a slanted wellbore
Inventor:
Roy R. Vann
Patented Case
View Patent ↗
Granted: May 26, 1981
Filed: Jan 8, 1980
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.