Granted Patent
Utility
US 5,197,621 · App. 07/598,709
Screw cap made of plastics material
Inventors:
Franz T. Bartl, Hans-Werner Breuer
Patented Case
View Patent ↗
Granted: Mar 30, 1993
Filed: Oct 30, 1990
Inventors
Franz T. Bartl
Hans-Werner Breuer
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.