Granted Patent
Utility
US 4,814,670 · App. 06/788,484
Cathode ray tube apparatus having focusing grids with horizontally and vertically oblong through holes
Inventors:
Hiroshi Suzuki, Masao Natsuhara, Chisato Kurusu
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Oct 17, 1985
Inventors
Hiroshi Suzuki
Masao Natsuhara
Chisato Kurusu
Assignee (at issue)
Matsushita Electronics 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.