Granted Patent
Utility
US 6,230,924 · App. 09/337,033
Closure indicator for cup lid
Inventors:
David Weiss, Ronald I. Kall
Patented Case
View Patent ↗
Granted: May 15, 2001
Filed: Jun 28, 1999
Inventors
David Weiss
Ronald I. Kall
Assignee (at issue)
Design Safety Corp.
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.