Granted Patent
Utility
US 4,480,690 · App. 06/465,565
Accelerated downhole pressure testing
Inventor:
Roy R. Vann
Patented Case
View Patent ↗
Granted: Nov 6, 1984
Filed: Feb 10, 1983
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.