Granted Patent
Utility
US 4,556,690 · App. 06/606,613
Acetal resin composition
Inventor:
Mikio Nakagawa
Patented Case
View Patent ↗
Granted: Dec 3, 1985
Filed: May 3, 1984
Inventor
Mikio Nakagawa
Assignee (at issue)
Mitsui Petrochemical Industries, 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.