Granted Patent
Utility
US 5,120,837 · App. 07/409,769
DNA encoding PHE a feedback inhibition resistant enzyme analogues
Inventors:
Ian Fotheringham, Jennifer Nelms
Patented Case
View Patent ↗
Granted: Jun 9, 1992
Filed: Sep 20, 1989
Inventors
Ian Fotheringham
Jennifer Nelms
Assignee (at issue)
The NutraSweet Company
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.