Inventor · disambiguated record
Mark O'Brien
Also filed as: O'BRIEN MARK · O'BRIEN MARK J
8 granted patents·523 citations·filing 1982–2007
90Inventor score
Files withVERIZON BUSINESS GLOBAL LLC2WORLDCOM INC2HANSON JOEL1KONA ASSOCIATES LIMITED PARTNE1MCI INC1
Top patents by PatentIndex Score
8 records- 0194US6697474B1Systems and methods for receiving telephone calls via instant messagingWORLDCOM INC·Filed 2001·Granted Feb 24, 2004·169 cites·25 claims
- 0285US6393017B1Virtual PBX systemWORLDCOM INC·Filed 1999·Granted May 21, 2002·103 cites·27 claims
- 0385US6351464B1Virtual second line hybrid network communication systemMCI WORLDCOM INC·Filed 1999·Granted Feb 26, 2002·186 cites·17 claims
- 0484US6775272B2Virtual PBX systemMCI INC·Filed 2002·Granted Aug 10, 2004·31 cites·25 claims
- 0567US7274778B2Systems and methods for receiving telephone calls via instant messagingVERIZON BUSINESS GLOBAL LLC·Filed 2004·Granted Sep 25, 2007·10 cites·17 claims
- 0666US7496091B2Virtual PBX systemVERIZON BUSINESS GLOBAL LLC·Filed 2004·Granted Feb 24, 2009·7 cites·16 claims
- 0743US8553857B2Systems and methods for receiving telephone calls via instant messagingHANSON JOEL·Filed 2007·Granted Oct 8, 2013·0 cites·23 claims
- 0842US4452461ABoomerangKONA ASSOCIATES LIMITED PARTNE·Filed 1982·Granted Jun 5, 1984·17 cites·8 claims
Join the waitlist — get patent alerts
Get an alert when Mark O'Brien files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →