Granted Patent
Utility
US 4,612,992 · App. 06/721,536
Single trip completion of spaced formations
Inventors:
Roy R. Vann, Emmet F. Brieger
Patented Case
View Patent ↗
Granted: Sep 23, 1986
Filed: Apr 10, 1985
Inventors
Roy R. Vann
Emmet F. Brieger
Assignee (at issue)
Halliburton
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.