Granted Patent
Utility
US 4,520,103 · App. 06/437,035
Microbial production of indigo
Inventor:
Burt D. Ensley
Patented Case
View Patent ↗
Granted: May 28, 1985
Filed: Oct 27, 1982
Inventor
Burt D. Ensley
Assignee (at issue)
Amgen Inc.
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.