Granted Patent
Utility
US 4,258,306 · App. 05/943,629
State of battery charge indicator circuit
Inventors:
Robert F. Bourke, David K. Johansen
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Sep 19, 1978
Inventors
Robert F. Bourke
David K. Johansen
Assignee (at issue)
Gould Inc.
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.