Granted Patent
Utility
US 4,240,022 · App. 05/891,305
Battery charging circuit for portable power tool
Inventors:
David C. Kilinskis, Louis J. Vassos
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Mar 29, 1978
Inventors
David C. Kilinskis
Louis J. Vassos
Assignee (at issue)
Skil 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.