Granted Patent
Utility
US 4,380,138 · App. 06/253,440
Abrasive liquid jet cutting
Inventor:
Peter Hofer
Patented Case
View Patent ↗
Granted: Apr 19, 1983
Filed: Apr 13, 1981
Inventor
Peter Hofer
Assignee (at issue)
International Harvester 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.