Granted Patent
Utility
US 6,741,691 · App. 09/622,537
Call-back method for telecommunications and devices adapted accordingly
Inventors:
Rudolf Ritter, Walter Heutschi
Patented Case
View Patent ↗
Granted: May 25, 2004
Filed: Aug 18, 2000
Inventors
Rudolf Ritter
Walter Heutschi
Assignee (at issue)
Swisscom Mobile AG
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.