Granted Patent
Utility
US 4,287,869 · App. 06/048,712
Charging system for cutting blade
Inventor:
Frederick Schmid
Patented Case
View Patent ↗
Granted: Sep 8, 1981
Filed: Jun 15, 1979
Inventor
Frederick Schmid
Assignee (at issue)
Crystal Systems 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.