Granted Patent
Utility
US 5,680,970 · App. 08/650,346
Self closing dispensing valve biased by resilient fingers
Inventors:
Mark A. Smith, M. Stephen Tschanen
Patented Case
View Patent ↗
Granted: Oct 28, 1997
Filed: May 20, 1996
Inventors
Mark A. Smith
M. Stephen Tschanen
Assignee (at issue)
Liqui-Box Corporation
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.