Granted Patent
Utility
US 4,554,221 · App. 06/693,983
Rechargeable battery pack
Inventor:
Hartmut Schmid
Patented Case
View Patent ↗
Granted: Nov 19, 1985
Filed: Jan 23, 1985
Inventor
Hartmut Schmid
Assignee (at issue)
DSL Dynamic Sciences Limited
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.