Granted Patent
Utility
US 4,485,212 · App. 06/498,613
Impact resistant blend of polybutylene terephthalate resin and OSA graft copolymer
Inventor:
John M. Wefer
Patented Case
View Patent ↗
Granted: Nov 27, 1984
Filed: May 27, 1983
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.