Granted Patent
Utility
US 5,034,740 · App. 07/411,743
Capacitive card module
Inventor:
Gottfried Acher
Patented Case
View Patent ↗
Granted: Jul 23, 1991
Filed: Sep 25, 1989
Inventor
Gottfried Acher
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.