Granted Patent
Utility
US 6,552,121 · App. 10/015,064
Alkali silicate-polyisocyanate composites
Inventor:
Robert A. Grigsby, Jr.
Patented Case
View Patent ↗
Granted: Apr 22, 2003
Filed: Dec 11, 2001
Inventor
Robert A. Grigsby, Jr.
Assignee (at issue)
HUNTSMAN PETROCHEMICAL LLC
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.