Granted Patent
Utility
US 4,966,968 · App. 07/436,805
Indan derivatives
Inventors:
Isao Hashimoto, Keiichi Yokoyama, Takumi Kitahara
Patented Case
View Patent ↗
Granted: Oct 30, 1990
Filed: Nov 15, 1989
Inventors
Isao Hashimoto
Keiichi Yokoyama
Takumi Kitahara
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.