Granted Patent
Utility
US 4,971,590 · App. 07/439,992
Process for improving the emissivity of a non-based tension shadow mask
Inventor:
Hua-Sou Tong
Patented Case
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Granted: Nov 20, 1990
Filed: Nov 20, 1989
Inventor
Hua-Sou Tong
Assignee (at issue)
Zenith Electronics LLC
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.