Granted Patent
Utility
US 6,388,147 · App. 09/445,742
Production of 1,2-dihydro and 2,2-dihydro hexafluoropropanes and azeotropes thereof with HF
Inventors:
Velliyur Nott Mallikarjuna Rao, Francis John Walczak
Patented Case
View Patent ↗
Granted: May 14, 2002
Filed: Dec 10, 1999
Inventors
Velliyur Nott Mallikarjuna Rao
Francis John Walczak
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.