Granted Patent
Utility
US 4,895,964 · App. 07/214,512
Quarternary ammonium pendant siloxane copolymers
Inventor:
Anthony J. Margida
Patented Case
View Patent ↗
Granted: Jan 23, 1990
Filed: Jul 1, 1988
Inventor
Anthony J. Margida
Assignee (at issue)
Union Carbide Chemicals & Plastics
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.