Granted Patent
Utility
US 4,444,320 · App. 06/299,319
Stackable shelf unit
Inventor:
John P. Chap
Patented Case
View Patent ↗
Granted: Apr 24, 1984
Filed: Sep 4, 1981
Inventor
John P. Chap
Assignee (at issue)
Selfix, 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.