Granted Patent
Utility
US 6,836,543 · App. 09/600,061
Operating surface for class functions in a telephone
Inventor:
Matthias Schneider-Hufschmidt
Patented Case
View Patent ↗
Granted: Dec 28, 2004
Filed: Jul 10, 2000
Inventor
Matthias Schneider-Hufschmidt
Assignee (at issue)
Siemens Aktiengesellschaft
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.