Granted Patent
Utility
US 5,991,639 · App. 08/940,398
System for transferring a call and a mobile station
Inventors:
Markku Rautiola, Juha Kalliokulju, Toni Sormunen, Harri Halminen
Patented Case
View Patent ↗
Granted: Nov 23, 1999
Filed: Oct 1, 1997
Inventors
Markku Rautiola
Juha Kalliokulju
Toni Sormunen
Harri Halminen
Assignee (at issue)
Nokia Mobile Phones Ltd.
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.