Granted Patent
Utility
US 3,989,429 · App. 05/672,964
Reinforced membrane
Inventor:
William F. Mattson
Patented Case
View Patent ↗
Granted: Nov 2, 1976
Filed: Apr 2, 1976
Inventor
William F. Mattson
Assignee (at issue)
B. F. Goodrich 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.