Granted Patent
Utility
US 5,153,255 · App. 07/767,548
Process for preparing a rubber composition having two different molecular weights
Inventors:
Makoto Kondo, Isao Sugita, Fumio Tsutsumi, Isao Furuta
Patented Case
View Patent ↗
Granted: Oct 6, 1992
Filed: Sep 27, 1991
Inventors
Makoto Kondo
Isao Sugita
Fumio Tsutsumi
Isao Furuta
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.