Granted Patent
Utility
US 4,408,247 · App. 06/185,776
High voltage protection circuit for x-ray systems
Inventor:
David Matthew Joseph Cowell
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Sep 10, 1980
Inventor
David Matthew Joseph Cowell
Assignee (at issue)
Sybron 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.