Granted Patent
Utility
US 5,871,644 · App. 08/750,350
Filter for brewed beverages, especially coffee filter, and process for producing it
Inventors:
Werner Simon, Lutz Wittenschlaeger, Fred Bergmann
Patented Case
View Patent ↗
Granted: Feb 16, 1999
Filed: Mar 11, 1997
Inventors
Werner Simon
Lutz Wittenschlaeger
Fred Bergmann
Assignee (at issue)
Melitta Haushaltsprodukte GmbH & Co. KG
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.