Granted Patent
Utility
US 6,445,912 · App. 09/572,144
System and method for checking service availability
Inventors:
Allen Cole, Susan Engquist, Xinguo Wei
Patented Case
View Patent ↗
Granted: Sep 3, 2002
Filed: May 17, 2000
Inventors
Allen Cole
Susan Engquist
Xinguo Wei
Assignee (at issue)
AT&T WIRELESS SERVICES, INC.
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.