Granted Patent
Utility
US 4,122,378 · App. 05/751,417
Solid state switching circuit for an electromagnetic pump
Inventor:
Ralph V. Brown
Patented Case
View Patent ↗
Granted: Oct 24, 1978
Filed: Dec 16, 1976
Inventor
Ralph V. Brown
Assignee (at issue)
Facet Enterprises, Incorporated
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.