Granted Patent
Utility
US 4,990,635 · App. 07/294,016
Synthesis of 6-methylene derivatives of androsta-1,4-diene-3,17-dione
Inventors:
Antonio Longo, Paolo Lombardi
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Jan 6, 1989
Inventors
Antonio Longo
Paolo Lombardi
Assignee (at issue)
Farmitalia Carlo Erba S.r.l.
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.