Granted Patent
Utility
US 6,214,955 · App. 09/194,282
Partially fluorinated polymers
Inventor:
Zhen-Yu Yang
Patented Case
View Patent ↗
Granted: Apr 10, 2001
Filed: Nov 23, 1998
Inventor
Zhen-Yu Yang
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.