Granted Patent
Utility
US 4,598,771 · App. 06/706,587
Method and apparatus for firing a perforating gun and simultaneously recording the downhole pressure
Inventor:
Roy R. Vann
Patented Case
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Granted: Jul 8, 1986
Filed: Feb 28, 1985
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.