Granted Patent
Utility
US 4,138,504 · App. 05/818,242
Food service method
Inventors:
Anthony C. Mack, George K. Shumrak
Patented Case
View Patent ↗
Granted: Feb 6, 1979
Filed: Jul 22, 1977
Inventors
Anthony C. Mack
George K. Shumrak
Assignee (at issue)
Sweetheart Plastics, 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.