Granted Patent
Utility
US 4,360,385 · App. 06/224,429
Water repellent compositions for the treatment of wood
Inventor:
John F. Grunewalder
Patented Case
View Patent ↗
Granted: Nov 23, 1982
Filed: Jan 12, 1981
Inventor
John F. Grunewalder
Assignee (at issue)
PPG Industries, 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.