Granted Patent
Utility
US 6,044,992 · App. 09/090,304
Ratchets for bottle necks
Inventor:
Xiaoli Ma
Patented Case
View Patent ↗
Granted: Apr 4, 2000
Filed: Jun 3, 1998
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.