Granted Patent
Utility
US 5,988,425 · App. 09/008,771
Sipper cup
Inventors:
Gregory C. Yehl, James Keane
Patented Case
View Patent ↗
Granted: Nov 23, 1999
Filed: Jan 19, 1998
Inventors
Gregory C. Yehl
James Keane
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.