Granted Patent
Utility
US 5,837,522 · App. 08/795,421
Method for introducing oxygen into a propagation zone of fermentation process
Inventor:
Robert Swain
Patented Case
View Patent ↗
Granted: Nov 17, 1998
Filed: Feb 4, 1997
Inventor
Robert Swain
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.