Granted Patent
Utility
US 4,334,620 · App. 06/191,852
Key storage rack
Inventor:
Mitchell L. Block
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Sep 29, 1980
Inventor
Mitchell L. Block
Assignee (at issue)
Block, 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.