Granted Patent
Utility
US 4,245,055 · App. 06/103,554
Expandable rubber/resin blend and resulting foam
Inventor:
Wayne E. Smith
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: Dec 14, 1979
Inventor
Wayne E. Smith
Assignee (at issue)
Armstrong Cork 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.