Granted Patent
Utility
US 4,990,608 · App. 07/362,587
Diaphragm wall construction gelatin composition
Inventor:
Jose Zapico
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Jun 7, 1989
Inventor
Jose Zapico
Assignee (at issue)
Aqualon 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.