Granted Patent
Utility
US 4,436,154 · App. 06/236,867
Method for controlling subsurface blowout
Inventors:
Roy R. Vann, Flint R. George
Patented Case
View Patent ↗
Granted: Mar 13, 1984
Filed: Feb 23, 1981
Inventors
Roy R. Vann
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.