Granted Patent
Utility
US 4,931,499 · App. 07/272,823
Rubber composition derived from fluoroelastomer and ethylene-alpha-olefin copolymer rubber and rubber article formed therefrom
Inventors:
Masato Sakai, Itsuki Umeda, Yasuo Takeuchi, Yasuhiko Takemura
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: Nov 18, 1988
Inventors
Masato Sakai
Itsuki Umeda
Yasuo Takeuchi
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.