Granted Patent
Utility
US 4,257,537 · App. 06/067,965
Child resistant sifter type closure
Inventor:
Albert R. Uhlig
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Aug 20, 1979
Inventor
Albert R. Uhlig
Assignee (at issue)
Owens-Illinois 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.