Granted Patent
Utility
US 5,173,409 · App. 07/447,966
Recovery of BT endotoxin protein from lysed cell mixtures
Inventor:
Leigh H. English
Patented Case
View Patent ↗
Granted: Dec 22, 1992
Filed: Dec 8, 1989
Inventor
Leigh H. English
Assignee (at issue)
Ecogen, 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.