Granted Patent
Utility
US 4,622,181 · App. 06/662,283
Process for producing an estrone acetal
Inventors:
Kazumasa Kinugasa, Eiichiro Tanaka, Yoshihiro Tanaka, Yoshiharu Morita
Patented Case
View Patent ↗
Granted: Nov 11, 1986
Filed: Sep 21, 1984
Inventors
Kazumasa Kinugasa
Eiichiro Tanaka
Yoshihiro Tanaka
Yoshiharu Morita
Assignee (at issue)
Mitsubishi Chemical 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.