Granted Patent
Utility
US 5,046,677 · App. 07/347,387
Cassette for holding a roll
Inventors:
Erhard Loewe, Ludger Bertels
Patented Case
View Patent ↗
Granted: Sep 10, 1991
Filed: May 1, 1989
Inventors
Erhard Loewe
Ludger Bertels
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.