Granted Patent
Utility
US 4,454,948 · App. 06/323,962
Gravity feed display unit
Inventor:
William S. Spamer
Patented Case
View Patent ↗
Granted: Jun 19, 1984
Filed: Nov 23, 1981
Inventor
William S. Spamer
Assignee (at issue)
The Mead 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.