Granted Patent
Utility
US 6,112,923 · App. 09/323,571
Tamper evident bottle cap
Inventor:
Xiaoli Ma
Patented Case
View Patent ↗
Granted: Sep 5, 2000
Filed: Jun 1, 1999
Inventor
Xiaoli Ma
Assignee (at issue)
Portola Packaging, Inc.
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.