Granted Patent
Utility
US 4,317,040 · App. 06/242,097
Low ripple regulated X-ray tube power supply filament transformer
Inventor:
Don E. Wuerflein
Patented Case
View Patent ↗
Granted: Feb 23, 1982
Filed: Mar 9, 1981
Inventor
Don E. Wuerflein
Assignee (at issue)
Pennwalt 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.