Granted Patent
Utility
US 4,812,192 · App. 07/179,791
Process and apparatus for cutting and sealing multiple plies of thermoplastic material having thickened sections
Inventors:
Timothy R. Woods, R. Douglas Behr
Patented Case
View Patent ↗
Granted: Mar 14, 1989
Filed: Apr 11, 1988
Inventors
Timothy R. Woods
R. Douglas Behr
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.