Granted Patent
Utility
US 4,293,355 · App. 06/073,928
Method for ultrasonically welding plasticized thermoplastic polymeric foam wares
Inventor:
Albert R. Wacker
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: Sep 10, 1979
Inventor
Albert R. Wacker
Assignee (at issue)
Cabot Corporation
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.