IP Library › Granted Patent US 5,978,459
Granted Patent Utility
US 5,978,459 · App. 08/580,207

Encryption of telephone calling card codes

Inventors: Elaine E. Reed, Kevin McMahon
Patented Case View Patent ↗
Granted: Nov 2, 1999 Filed: Dec 28, 1995
Inventors
Elaine E. Reed
Kevin McMahon
Assignee (at issue)
MCI Communications Corporation

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Quick Facts
Patent No.
US 5,978,459
App. No.
08/580,207
Filed
1995-12-28
Granted
1999-11-02
Kind
A