Granted Patent
Utility
US 5,075,821 · App. 07/609,751
DC to DC converter apparatus
Inventor:
John E. McDonnal
Patented Case
View Patent ↗
Granted: Dec 24, 1991
Filed: Nov 5, 1990
Inventor
John E. McDonnal
Assignee (at issue)
RO Associates
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.