Granted Patent
Utility
US 6,052,439 · App. 09/001,426
Network server platform telephone directory white-yellow page services
Inventors:
Irwin Gerszberg, Kenny Xiaojian Huang, Christopher K. Kwabi, Jeffrey S. Martin
Patented Case
View Patent ↗
Granted: Apr 18, 2000
Filed: Dec 31, 1997
Inventors
Irwin Gerszberg
Kenny Xiaojian Huang
Christopher K. Kwabi
Jeffrey S. Martin
Assignee (at issue)
AT&T CORP.
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.