Granted Patent
Utility
US 4,253,602 · App. 06/054,719
Tray container with double panel sidewalls
Inventor:
Francis V. Kulig
Patented Case
View Patent ↗
Granted: Mar 3, 1981
Filed: Jul 5, 1979
Inventor
Francis V. Kulig
Assignee (at issue)
Federal Paper Board Co., 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.