Granted Patent
Utility
US 5,188,497 · App. 07/634,147
Guide for stack of disk-shaped elements
Inventors:
Rolf Hantelmann, Hartmut Schwark
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Dec 7, 1990
Inventors
Rolf Hantelmann
Hartmut Schwark
Assignee (at issue)
Schmalbach-Lubeca AG
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.