Granted Patent
Utility
US 4,948,428 · App. 07/244,846
Grouting composition and method for grouting conduits in well bores
Inventor:
Andrew Liao
Patented Case
View Patent ↗
Granted: Aug 14, 1990
Filed: Sep 14, 1988
Inventor
Andrew Liao
Assignee (at issue)
Baroid Technology, 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.