Granted Patent
Utility
US 4,493,592 · App. 06/425,346
Grouting method
Inventor:
Lloyd C. Knox
Patented Case
View Patent ↗
Granted: Jan 15, 1985
Filed: Sep 28, 1982
Inventor
Lloyd C. Knox
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.