Granted Patent
Utility
US 4,893,440 · App. 07/355,880
Abrasive jet machining
Inventors:
Ben J. Gallant, Walter Kulischenko
Patented Case
View Patent ↗
Granted: Jan 16, 1990
Filed: May 19, 1989
Inventors
Ben J. Gallant
Walter Kulischenko
Assignee (at issue)
Airsonics License Partnership
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.