Granted Patent
Utility
US 6,057,640 · App. 08/898,818
Shadow mask for color cathode ray tube with slots sized to improve mechanical strength and brightness
Inventor:
Nobumitsu Aibara
Patented Case
View Patent ↗
Granted: May 2, 2000
Filed: Jul 23, 1997
Inventor
Nobumitsu Aibara
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.