Telecommunications Research Laboratories
69Patents
11Active
69Granted
44Portfolio score
Filing activity: Aug 4, 1989 → May 20, 2013 · 7 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7339937B2 | Wide-area content-based routing architecture | Electricity | 218 | Expired |
| US8976763B2 | Method and system for allocation guaranteed time slots for efficient transmission of time-critical data in IEEE 802.15.4 wireless personal area networks | Electricity | 183 | Active |
| US5784032A | Compact diversity antenna with weak back near fields | Electricity | 168 | Expired |
| US5841841A | Networking computers via shared use of voice telephone lines | Electricity | 161 | Expired |
| US5889759A | OFDM timing and frequency recovery system | Electricity | 139 | Expired |
| US6246861A | Cellular telephone location system | Physics | 118 | Expired |
| US5825257A | GMSK modulator formed of PLL to which continuous phase modulated signal is applied | Electricity | 118 | Expired |
| US6889060B2 | Optical fiber based on wireless scheme for wideband multimedia access | Electricity | 116 | Expired |
| US6377543B1 | Path restoration of networks | Electricity | 100 | Expired |
| US6791473B2 | Smart parking meter system | Physics | 94 | Expired |
| US5723176A | Method and apparatus for making optical components by direct dispensing of curable liquid | Physics | 86 | Expired |
| US5850505A | Method for preconfiguring a network to withstand anticipated failures | Electricity | 82 | Expired |
| US5999300A | Hybrid single sideband optical modulator | Electricity | 78 | Expired |
| US6140972A | Multiport antenna | Electricity | 77 | Expired |
| US6021110A | OFDM timing and frequency recovery system | Electricity | 76 | Expired |
| US5067126A | Method and apparatus for mapping a digital signal carrier to another | Emerging Cross-Sectional Technologies | 74 | Expired |
| US5880870A | Optical modulation system | Electricity | 73 | Expired |
| US5887022A | Peer-peer frequency hopping spread spectrum wireless system | Electricity | 68 | Expired |
| US6031866A | Duplex decision feedback equalization system | Electricity | 68 | Expired |
| US6597660B1 | Method for real-time traffic analysis on packet networks | Electricity | 59 | Expired |
| US5848139A | Telecommunication traffic pricing control system | Electricity | 55 | Expired |
| US6259836A | Optical frequency shifter and transmission system | Electricity | 52 | Expired |
| US5291031A | Optical phase difference range determination in liquid level sensor | Physics | 48 | Expired |
| US6424309B1 | Broadband compact slot dipole/monopole and electric dipole/monopole combined antenna | Electricity | 43 | Expired |
| US6421349B1 | Distributed preconfiguration of spare capacity in closed paths for network restoration | Electricity | 42 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.