Granted Patent
Utility
US 5,148,024 · App. 07/676,447
Ion beam processing apparatus and gas gun therefor
Inventor:
Chugo Watanabe
Patented Case
View Patent ↗
Granted: Sep 15, 1992
Filed: Mar 28, 1991
Inventor
Chugo Watanabe
Assignee (at issue)
SEIKO INSTRUMENTS 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.