Granted Patent
Utility
US 4,465,159 · App. 06/474,617
Nonlinear ear protecting device
Inventor:
John P. Stallings
Patented Case
View Patent ↗
Granted: Aug 14, 1984
Filed: Mar 11, 1983
Inventor
John P. Stallings
Assignee (at issue)
Cabot Corporation
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.