Inventor · disambiguated record
David A. Tschirhart
Also filed as: TSCHIRHART DAVID A · TSCHIRHART DAVID ALLEN
14 granted patents·3 pending applications·72 citations·filing 1997–2024
87Inventor score
Top patents by PatentIndex Score
17 records- 0178US6178438B1Service management system for an advanced intelligent networkALCATEL USA SOURCING LP·Filed 1997·Granted Jan 23, 2001·68 cites·15 claims
- 0277US12244488B2Carrier identification code delivery to an egress network of a telecommunications networkLEVEL 3 COMMUNICATIONS LLC·Filed 2024·Granted Mar 4, 2025·0 cites·19 claims
- 0376US10362631B2Last resource disaster routing in a telecommunications networkLEVEL 3 COMMUNICATIONS LLC·Filed 2018·Granted Jul 23, 2019·2 cites·20 claims
- 0469US10257590B2Enterprise toll-free call routingLEVEL 3 COMMUNICATIONS LLC·Filed 2014·Granted Apr 9, 2019·2 cites·15 claims
- 0568US11929918B2Carrier identification code delivery to an egress network of a telecommunications networkLEVEL 3 COMMUNICATIONS LLC·Filed 2021·Granted Mar 12, 2024·0 cites·20 claims
- 0660US2024267470A1Method and system for routing of inbound toll-free communicationsLEVEL 3 COMMUNICATIONS LLC·Filed 2024·Application pending·0 cites
- 0758US10575366B2Last resource disaster routing in a telecommunications networkLEVEL 3 COMMUNICATIONS LLC·Filed 2019·Granted Feb 25, 2020·0 cites·20 claims
- 0856US11936804B2Method and system for routing of inbound toll-free communicationsLEVEL 3 COMMUNICATIONS LLC·Filed 2022·Granted Mar 19, 2024·0 cites·17 claims
- 0953US11233728B2Carrier identification code delivery to an egress network of a telecommunications networkLEVEL 3 COMMUNICATIONS LLC·Filed 2016·Granted Jan 25, 2022·0 cites·20 claims
- 1053US2024430366A1Method and system for routing of inbound toll-free and tolled communicationsLEVEL 3 COMMUNICATIONS LLC·Filed 2024·Application pending·0 cites
- 1152US10341197B2Virtual service control point in a networkLEVEL 3 COMMUNICATIONS LLC·Filed 2018·Granted Jul 2, 2019·0 cites·19 claims
- 1251US11316983B2Method and system for routing of inbound toll-free communicationsLEVEL 3 COMMUNICATIONS LLC·Filed 2020·Granted Apr 26, 2022·0 cites·16 claims
- 1351US10524023B2Enterprise toll-free call routingLEVEL 3 COMMUNICATIONS LLC·Filed 2019·Granted Dec 31, 2019·0 cites·20 claims
- 1451US2019245981A1Method and system for routing of inbound toll-free communicationsLEVEL 3 COMMUNICATIONS LLC·Filed 2019·Application pending·0 cites
- 1546US9912551B2Virtual service control point in a networkLEVEL 3 COMMUNICATIONS LLC·Filed 2015·Granted Mar 6, 2018·0 cites·20 claims
- 1643US10270917B2Method and system for routing of inbound toll-free communicationsLEVEL 3 COMMUNICATIONS LLC·Filed 2015·Granted Apr 23, 2019·0 cites·12 claims
- 1736US8761369B2Central services hub for a telecommunications networkTERPSTRA RICHARD DEAN·Filed 2012·Granted Jun 24, 2014·0 cites·20 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →