Granted Patent
Utility
US 4,852,323 · App. 07/200,280
Nonpenetrating roof membrane fastening system
Inventor:
Henry A. Kartfilt
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: May 31, 1988
Inventor
Henry A. Kartfilt
Assignee (at issue)
The Firestone Tire & Rubber Company
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.