Granted Patent
Utility
US 4,520,567 · App. 06/485,593
Power pierce can opener
Inventor:
John G. Crawford
Patented Case
View Patent ↗
Granted: Jun 4, 1985
Filed: Apr 18, 1983
Inventor
John G. Crawford
Assignee (at issue)
BLACK & DECKER INC.
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.