Granted Patent
Utility
US 5,149,976 · App. 07/576,577
Charged particle beam pattern generation apparatus and method
Inventor:
Dale M. Sipma
Patented Case
View Patent ↗
Granted: Sep 22, 1992
Filed: Aug 31, 1990
Inventor
Dale M. Sipma
Assignee (at issue)
Hughes Aircraft 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.