Granted Patent
Utility
US 4,311,646 · App. 06/190,223
Process for the preparation of 4,6-dien-3-one steroids
Inventors:
Issei Nitta, Toshio Haruyama, Shinya Inoue
Patented Case
View Patent ↗
Granted: Jan 19, 1982
Filed: Sep 24, 1980
Inventors
Issei Nitta
Toshio Haruyama
Shinya Inoue
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.