Granted Patent
Utility
US 4,810,927 · App. 06/861,253
Color display tube with shadow mask and fabricating method thereof
Inventor:
Tetsuya Watanabe
Patented Case
View Patent ↗
Granted: Mar 7, 1989
Filed: May 9, 1986
Inventor
Tetsuya Watanabe
Assignee (at issue)
MITSUBISHI ELECTRIC 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.