Inventor
TSCHIRHART DAVID A
US11 patents
⚠️ This page may combine multiple inventors who share the name “TSCHIRHART DAVID A”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
LEVEL 3 COMMUNICATIONS LLC
10 patentsUS10362631B2Jul 23, 2019
Last resource disaster routing in a telecommunications network
LEVEL 3 COMMUNICATIONS LLC2 citations71
US10257590B2Apr 9, 2019
Enterprise toll-free call routing
LEVEL 3 COMMUNICATIONS LLC2 citations67
US12244488B2Mar 4, 2025
Carrier identification code delivery to an egress network of a telecommunications network
LEVEL 3 COMMUNICATIONS LLC0 citations60
US11929918B2Mar 12, 2024
Carrier identification code delivery to an egress network of a telecommunications network
LEVEL 3 COMMUNICATIONS LLC0 citations60
US11233728B2Jan 25, 2022
Carrier identification code delivery to an egress network of a telecommunications network
LEVEL 3 COMMUNICATIONS LLC0 citations60
US11936804B2Mar 19, 2024
Method and system for routing of inbound toll-free communications
LEVEL 3 COMMUNICATIONS LLC0 citations53
US11316983B2Apr 26, 2022
Method and system for routing of inbound toll-free communications
LEVEL 3 COMMUNICATIONS LLC0 citations53
US10575366B2Feb 25, 2020
Last resource disaster routing in a telecommunications network
LEVEL 3 COMMUNICATIONS LLC0 citations50
US10524023B2Dec 31, 2019
Enterprise toll-free call routing
LEVEL 3 COMMUNICATIONS LLC0 citations46
US10270917B2Apr 23, 2019
Method and system for routing of inbound toll-free communications
LEVEL 3 COMMUNICATIONS LLC0 citations39