Granted Patent
Utility
US 4,258,298 · App. 06/107,986
Dynamic focus control and power supply for cathode ray tube displays
Inventors:
Hugh C. Hilburn, Thomas W. Spilsbury
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Dec 28, 1979
Inventors
Hugh C. Hilburn
Thomas W. Spilsbury
Assignee (at issue)
Sperry Corp.
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.