Granted Patent
Utility
US 5,507,021 · App. 08/137,154
Method to input alphanumerical information into a device having a central computer, a memory, and a keypad
Inventor:
Gert Siegle
Patented Case
View Patent ↗
Granted: Apr 9, 1996
Filed: Oct 21, 1993
Inventor
Gert Siegle
Assignee (at issue)
Robert Bosch GmbH
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.