Granted Patent
Utility
US 4,990,825 · App. 07/405,275
Cathode ray tube having stress resistant frame
Inventors:
Keitaro Tsukui, Junko Itoh, Koji Nakamura
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Sep 11, 1989
Inventors
Keitaro Tsukui
Junko Itoh
Koji Nakamura
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.