Granted Patent
Utility
US 5,621,891 · App. 07/978,097
Device for generating announcement information
Inventors:
Hans-Wilhelm Ruhl, Peter Meyer
Patented Case
View Patent ↗
Granted: Apr 15, 1997
Filed: Nov 19, 1992
Inventors
Hans-Wilhelm Ruhl
Peter Meyer
Assignee (at issue)
U.S. Philips Corporation
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.