Granted Patent
Utility
US 5,131,625 · App. 07/757,455
One-time use disposable bottle valve
Inventors:
Thomas G. Hacker, Thomas P. Maxwell
Patented Case
View Patent ↗
Granted: Jul 21, 1992
Filed: Sep 10, 1991
Inventors
Thomas G. Hacker
Thomas P. Maxwell
Assignee (at issue)
Minnesota Mining and Manufacturing Company
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.