Granted Patent
Utility
US 6,136,221 · App. 09/232,974
Phosphation reagent
Inventor:
Robert Lee Reierson
Patented Case
View Patent ↗
Granted: Oct 24, 2000
Filed: Jan 21, 1999
Inventor
Robert Lee Reierson
Assignee (at issue)
Rhodia, 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.