Granted Patent
Utility
US 4,434,854 · App. 06/378,155
Pressure actuated vent assembly for slanted wellbores
Inventors:
Roy R. Vann, George W. Ribble, Flint R. George
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: May 14, 1982
Inventors
Roy R. Vann
George W. Ribble
Flint R. George
Assignee (at issue)
Geo Vann, Inc.
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.