Teltrend, Inc.
🏢 View company profile →25Patents
0Active
25Granted
32Portfolio score
Filing activity: Feb 26, 1992 → Jan 13, 1999
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5315650A | Caller identification transmit path limiter | Electricity | 50 | Expired |
| US5224149A | Testing system for digital transmission lines | Electricity | 33 | Expired |
| US6111949A | Method of rapid automatic hybrid balancing | Electricity | 25 | Expired |
| US5682385A | Enhancement for a multiplexing telecommunications interface | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5555274A | Phantom data link for digital transmission lines | Electricity | 19 | Expired |
| US5438606A | Open power loop detector for transmission line elements | Electricity | 15 | Expired |
| US5566239A | Floating digital loop carrier telephone interface | Electricity | 13 | Expired |
| US5509065A | Dual span monitoring system for maintenance shelf control | Electricity | 13 | Expired |
| US5422950A | Remote terminal channel unit for telephone transmission lines | Electricity | 12 | Expired |
| US5907614A | High density telephone network interface unit | Electricity | 12 | Expired |
| US5689546A | Performance monitoring system for T1 telephone lines | Electricity | 12 | Expired |
| US5680405A | Remote reporting system for digital transmission line elements | Electricity | 11 | Expired |
| US5953412A | Method and apparatus for controlling line conditioner equalizer | Electricity | 10 | Expired |
| US5521977A | High density telephone network interface unit | Electricity | 8 | Expired |
| US5963638A | Adjustable hybrid having improved biasing configuration | Electricity | 8 | Expired |
| US5974137A | AGC amplifier for two-wire line conditioner | Electricity | 8 | Expired |
| US5862200A | Ground fault detector for T1 span equipment | Electricity | 7 | Expired |
| US5444776A | Bridge for a network interface unit | Electricity | 7 | Expired |
| US5631956A | High density telephone network interface unit | Electricity | 6 | Expired |
| US5347544A | Gain or loss compensation circuit for telephone lines | Electricity | 6 | Expired |
| US6151691A | Remote reporting system for digital transmission line elements | Electricity | 5 | Expired |
| US5437023A | Noise-tolerant address transmission system for digital telecommunication network | Electricity | 5 | Expired |
| US5889785A | Remote reporting system for digital transmission line elements | Electricity | 5 | Expired |
| US5357569A | Trans-hybrid loss compensator for on hook transmission | Electricity | 4 | Expired |
| US5691998A | Data transmission protection circuit with error correction | Electricity | 2 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.