Granted Patent
Utility
US 4,213,902 · App. 06/008,173
Process for producing steroidal 7.alpha.-acylthio-4-en-3-ones
Inventors:
Hiromi Okushima, Issei Nitta, Rikizo Furuya
Patented Case
View Patent ↗
Granted: Jul 22, 1980
Filed: Jan 31, 1979
Inventors
Hiromi Okushima
Issei Nitta
Rikizo Furuya
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.