Granted Patent
Utility
US 6,184,187 · App. 09/056,085
Phosphorus compounds and their use as corrosion inhibitors for perfluoropolyethers
Inventors:
Jon Lee Howell, Michael A. Hofman
Patented Case
View Patent ↗
Granted: Feb 6, 2001
Filed: Apr 7, 1998
Inventors
Jon Lee Howell
Michael A. Hofman
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND 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.