Granted Patent
Utility
US 4,674,569 · App. 06/845,613
Stage cementing tool
Inventors:
Ernest A. Revils, Emmet J. Arboneaux, III, Brent J. Lirette
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: Mar 28, 1986
Inventors
Ernest A. Revils
Emmet J. Arboneaux, III
Brent J. Lirette
Assignee (at issue)
Chromalloy American Corp.
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.