XEL Communications, Inc.
12Patents
0Active
12Granted
33Portfolio score
Filing activity: Dec 15, 1989 → Nov 29, 1994
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5606725A | Broadband network having an upstream power transmission level that is dynamically adjusted as a function of the bit error rate | Electricity | 225 | Expired |
| US5488413A | CATV telephony system using subsplit band for both directions of transmission | Electricity | 97 | Expired |
| US5034978A | Universal channel unit switchable between two wire and four wire configurations | Electricity | 38 | Expired |
| US5408524A | Answer supervision over pulse code modulated carrier system and method therefore | Electricity | 21 | Expired |
| US5151935A | Programmable universal signaling circuit for a telephone network | Electricity | 16 | Expired |
| US5140625A | System for testing 2B1Q telephony loopback circuits and method therefor | Electricity | 12 | Expired |
| US5513173A | Data link access unit for T1 spans supporting the extended superframe format (ESF) | Electricity | 12 | Expired |
| US5131033A | Sealing current generator for a telephone circuit | Electricity | 12 | Expired |
| US5197068A | Intra channel bank communication protocols between channels and the line interface unit of a telephone system | Electricity | 7 | Expired |
| US5301187A | System for implementing broadband audio program telephony circuits using 2B1Q technology | Electricity | 6 | Expired |
| US5081670A | Smart data station termination (DST) without active equalizers | Electricity | 5 | Expired |
| US5247574A | Adaptive no balance DX signalling circuit | Electricity | 2 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.