Granted Patent
Utility
US 4,493,921 · App. 06/584,298
Impact resistant blend
Inventor:
John M. Wefer
Patented Case
View Patent ↗
Granted: Jan 15, 1985
Filed: Mar 2, 1984
Inventor
John M. Wefer
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.