Granted Patent
Utility
US 4,334,580 · App. 06/132,765
Continuous borehole formed horizontally through a hydrocarbon producing formation
Inventor:
Roy R. Vann
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Mar 24, 1980
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.