Granted Patent
Utility
US 4,849,478 · App. 07/158,037
Oil-resistant rubber composition
Inventors:
Yoji Mori, Yoshiaki Kawamura, Hironori Matsumoto, Yasuhiko Takemura
Patented Case
View Patent ↗
Granted: Jul 18, 1989
Filed: Feb 16, 1988
Inventors
Yoji Mori
Yoshiaki Kawamura
Hironori Matsumoto
Yasuhiko Takemura
Assignee (at issue)
Japan Synthetic Rubber Corporation
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.