Granted Patent
Utility
US 4,587,302 · App. 06/715,326
Butyl rubber and chlorinated rubber composition
Inventor:
Dominic A. Berta
Patented Case
View Patent ↗
Granted: May 6, 1986
Filed: Mar 25, 1985
Inventor
Dominic A. Berta
Assignee (at issue)
HERCULES 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.