Granted Patent
Utility
US 6,376,705 · App. 09/576,375
Manufacture of 3,3,4,4-tetrahydroperfluoroalkanoates
Inventor:
Weiming Qiu
Patented Case
View Patent ↗
Granted: Apr 23, 2002
Filed: May 22, 2000
Inventor
Weiming Qiu
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.