Granted Patent
Utility
US 5,871,111 · App. 08/530,237
Screwable closure cap with security against over-tightening
Inventors:
Georg Pfefferkorn, Michael Kirchgessner
Patented Case
View Patent ↗
Granted: Feb 16, 1999
Filed: May 15, 1996
Inventors
Georg Pfefferkorn
Michael Kirchgessner
Assignee (at issue)
Crown Cork
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.