Granted Patent
Utility
US 6,190,897 · App. 09/291,931
Phytase
Inventor:
Keith Kretz
Patented Case
View Patent ↗
Granted: Feb 20, 2001
Filed: Apr 13, 1999
Inventor
Keith Kretz
Assignee (at issue)
Diversa Corporation
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.