Granted Patent
Utility
US 5,497,412 · App. 08/224,457
Enhanced call delivery system for roaming cellular subscribers
Inventors:
Margaret Lannen, Kenneth W. Hammer, Edward Lawrence Didion
Patented Case
View Patent ↗
Granted: Mar 5, 1996
Filed: Apr 7, 1994
Inventors
Margaret Lannen
Kenneth W. Hammer
Edward Lawrence Didion
Assignee (at issue)
GTE Telecommunication Services Incorporated
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.