Granted Patent
Utility
US 4,831,491 · App. 07/114,943
Precipitative static drain strip system
Inventors:
Joseph T. Mueller, William W. Hornsey
Patented Case
View Patent ↗
Granted: May 16, 1989
Filed: Oct 30, 1987
Inventors
Joseph T. Mueller
William W. Hornsey
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.