Granted Patent
Utility
US 4,133,449 · App. 05/599,769
Plastic container
Inventor:
Efrem M. Ostrowsky
Patented Case
View Patent ↗
Granted: Jan 9, 1979
Filed: Jul 28, 1975
Inventor
Efrem M. Ostrowsky
Assignee (at issue)
Ethyl Products Company
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.