Granted Patent
Utility
US 6,007,939 · App. 08/886,387
Battery pack for cordless tools
Inventor:
Earl Clowers
Patented Case
View Patent ↗
Granted: Dec 28, 1999
Filed: Jul 1, 1997
Inventor
Earl Clowers
Assignee (at issue)
Porter-Cable 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.