Granted Patent
Utility
US 4,487,529 · App. 06/337,567
Grouting composition and method of using same
Inventor:
Donald L. Douty
Patented Case
View Patent ↗
Granted: Dec 11, 1984
Filed: Jan 7, 1982
Inventor
Donald L. Douty
Assignee (at issue)
United States Steel Corporation
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.