Granted Patent
Utility
US 5,349,020 · App. 08/026,783
Vulcanizable rubber composition
Inventors:
Keiji Okada, Kazuhiko Murata, Tetsuo Tojo, Masaaki Kawasaki, Toshimasa Takata
Patented Case
View Patent ↗
Granted: Sep 20, 1994
Filed: Mar 5, 1993
Inventors
Keiji Okada
Kazuhiko Murata
Tetsuo Tojo
Masaaki Kawasaki
Toshimasa Takata
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.