Granted Patent
Utility
US 3,946,897 · App. 05/454,355
Drum cover made from thermoplastic rubber
Inventor:
Anthony P. Wolff
Patented Case
View Patent ↗
Granted: Mar 30, 1976
Filed: Mar 25, 1974
Inventor
Anthony P. Wolff
Assignee (at issue)
Uniroyal Ltd.
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.