Granted Patent
Utility
US 3,993,752 · App. 04/848,336
Wood preservative containing alkali metal cyanides
Inventor:
Robert E. Stutz
Patented Case
View Patent ↗
Granted: Nov 23, 1976
Filed: Aug 7, 1969
Inventor
Robert E. Stutz
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.