Granted Patent
Utility
US 4,667,238 · App. 06/775,883
Noninvasive bad channel detection and correction
Inventor:
Robert Zwirn
Patented Case
View Patent ↗
Granted: May 19, 1987
Filed: Sep 13, 1985
Inventor
Robert Zwirn
Assignee (at issue)
Hughes Aircraft Company
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.