Granted Patent
Utility
US 4,467,933 · App. 06/311,910
Warp resistant closure for sanitary cans
Inventors:
Harlen E. Wilkinson, Theodore Sopher
Patented Case
View Patent ↗
Granted: Aug 28, 1984
Filed: Oct 16, 1981
Inventors
Harlen E. Wilkinson
Theodore Sopher
Assignee (at issue)
American Can 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.