Granted Patent
Utility
US 5,698,639 · App. 08/700,833
Ethylene-propylene-diene rubber, elastomer composition and vulcanized rubber thereof
Inventors:
Hidenari Nakahama, Takashi Mishima
Patented Case
View Patent ↗
Granted: Dec 16, 1997
Filed: Aug 21, 1996
Inventors
Hidenari Nakahama
Takashi Mishima
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.