Granted Patent
Utility
US 6,150,280 · App. 09/256,710
Electron-beam cell projection aperture formation method
Inventor:
Hiroshi Yamashita
Patented Case
View Patent ↗
Granted: Nov 21, 2000
Filed: Feb 24, 1999
Inventor
Hiroshi Yamashita
Assignee (at issue)
NEC CORPORATION
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.