Granted Patent
Utility
US 5,916,992 · App. 08/904,598
Polysiloxane polyols
Inventors:
Truman F. Wilt, David N. Walters, Karen D. Donnelly, Andrew R. Wolff
Patented Case
View Patent ↗
Granted: Jun 29, 1999
Filed: Aug 1, 1997
Inventors
Truman F. Wilt
David N. Walters
Karen D. Donnelly
Andrew R. Wolff
Assignee (at issue)
PPG Industries Ohio, Inc.
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.