Granted Patent
Utility
US 4,564,076 · App. 06/483,478
Well completion method and apparatus
Inventors:
Roy R. Vann, Emmet F. Brieger
Patented Case
View Patent ↗
Granted: Jan 14, 1986
Filed: Apr 11, 1983
Inventors
Roy R. Vann
Emmet F. Brieger
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.