Granted Patent
Utility
US 6,407,488 · App. 09/283,548
Color picture tube having a low expansion tension mask
Inventor:
Frank R. Ragland, Jr.
Patented Case
View Patent ↗
Granted: Jun 18, 2002
Filed: Apr 1, 1999
Inventor
Frank R. Ragland, Jr.
Assignee (at issue)
Thomson Licensing
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.