Granted Patent
Utility
US 4,967,608 · App. 07/346,073
Test chamber for particle emitters
Inventor:
Michael G. Yost
Patented Case
View Patent ↗
Granted: Nov 6, 1990
Filed: May 2, 1989
Inventor
Michael G. Yost
Assignee (at issue)
Ion Systems, Inc.
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.