Granted Patent
Utility
US 5,186,347 · App. 07/776,793
Spill-proof closure
Inventors:
Mark A. Freeman, Timothy Kent Stringer
Patented Case
View Patent ↗
Granted: Feb 16, 1993
Filed: Oct 15, 1991
Inventors
Mark A. Freeman
Timothy Kent Stringer
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.