Granted Patent
Utility
US 4,396,449 · App. 06/310,935
Cutting and sealing process for thermoplastic materials
Inventor:
Dennis R. Tumminia
Patented Case
View Patent ↗
Granted: Aug 2, 1983
Filed: Oct 13, 1981
Inventor
Dennis R. Tumminia
Assignee (at issue)
THE DOW CHEMICAL 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.