Granted Patent
Utility
US 5,975,320 · App. 08/853,669
Tamper-evident closures and container neck therefor
Inventors:
Steven H. Bietzer, Kurt A. Krischke, Daniel Luch, Richard E. Repp
Patented Case
View Patent ↗
Granted: Nov 2, 1999
Filed: May 9, 1997
Inventors
Steven H. Bietzer
Kurt A. Krischke
Daniel Luch
Richard E. Repp
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.