Granted Patent
Utility
US 5,733,983 · App. 08/750,821
Heat-resistant rubber composition
Inventors:
Takashi Hakuta, Tetsuo Tojo, Masaaki Kawasaki, Mikio Hosoya
Patented Case
View Patent ↗
Granted: Mar 31, 1998
Filed: Dec 10, 1996
Inventors
Takashi Hakuta
Tetsuo Tojo
Masaaki Kawasaki
Mikio Hosoya
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.