Granted Patent
Utility
US 5,934,497 · App. 09/070,056
Sanitary beverage can lid
Inventors:
Charles Chang, Lucy Chang
Patented Case
View Patent ↗
Granted: Aug 10, 1999
Filed: Apr 30, 1998
Inventors
Charles Chang
Lucy Chang
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.