Granted Patent
Utility
US 4,231,245 · App. 05/961,989
Indirect extrusion apparatus
Inventor:
Jintaro Ishiba
Patented Case
View Patent ↗
Granted: Nov 4, 1980
Filed: Nov 20, 1978
Inventor
Jintaro Ishiba
Assignee (at issue)
Yoshida Kogyo K.K.
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.