Granted Patent
Utility
US 4,801,418 · App. 07/155,334
Sealing compound
Inventor:
Bruno Bersano
Patented Case
View Patent ↗
Granted: Jan 31, 1989
Filed: Feb 12, 1988
Inventor
Bruno Bersano
Assignee (at issue)
W. R. Grace & Co.
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.