IP Library Granted Patent US 4,240,022
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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,240,022
App. No.
05/891,305
Filed
1978-03-29
Granted
1980-12-16
Kind
A