Granted Patent
Utility
US 6,482,969 · App. 10/001,760
Silicon based quaternary ammonium functional compositions and methods for making them
Inventors:
Liza Ruth Helmrick, John Joseph Kennan
Patented Case
View Patent ↗
Granted: Nov 19, 2002
Filed: Oct 24, 2001
Inventors
Liza Ruth Helmrick
John Joseph Kennan
Assignee (at issue)
Dow Corning Corporation
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.