Granted Patent
Utility
US 4,162,883 · App. 05/842,254
Apparatus for thermoforming hollow article having a high L/D ratio
Inventor:
Donald G. Sauer
Patented Case
View Patent ↗
Granted: Jul 31, 1979
Filed: Oct 14, 1977
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.