Granted Patent
Utility
US 4,335,109 · App. 06/216,123
Water repellent aqueous wood treating solutions
Inventor:
Robert Hill
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Dec 15, 1980
Inventor
Robert Hill
Assignee (at issue)
KOPPERS, 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.