Granted Patent
Utility
US 4,983,742 · App. 06/946,165
Fire-retardant 1-butene resin composition
Inventors:
Motoyasu Yusawa, Chikara Igarashi
Patented Case
View Patent ↗
Granted: Jan 8, 1991
Filed: Dec 23, 1986
Inventors
Motoyasu Yusawa
Chikara Igarashi
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.