Granted Patent
Utility
US 4,445,574 · App. 06/385,834
Continuous borehole formed horizontally through a hydrocarbon producing formation
Inventor:
Roy R. Vann
Patented Case
View Patent ↗
Granted: May 1, 1984
Filed: Jun 7, 1982
Inventor
Roy R. Vann
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.