Granted Patent
Utility
US 5,813,561 · App. 08/808,108
Sanitary beverage can lid
Inventors:
Charles Chang, Lucy Chang
Patented Case
View Patent ↗
Granted: Sep 29, 1998
Filed: Feb 28, 1997
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.