Granted Patent
Utility
US 4,309,380 · App. 06/059,027
Process for making multilayered containers
Inventor:
Donald G. Sauer
Patented Case
View Patent ↗
Granted: Jan 5, 1982
Filed: Jul 19, 1979
Inventor
Donald G. Sauer
Assignee (at issue)
National Crane 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.