Average Co-Inventor Count = 5.36
ph-index = 2
The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.
Company Filing History:
1. Hitachi, Ltd. (5 from 42,508 patents)
5 patents:
1. 7536110 - Optical transmission system for substantially equalizing the output signal level among frequency bands and substantially lowering the signal-to-noise ratio
2. 7391974 - Wavelength division multiplexing optical transmission equipment and method of amplifying optical wavelength division multiplexed signals
3. 7272325 - Optical transmission system for substantially equalizing the output signal level among frequency bands and substantially lowering the signal-to-noise ratio
4. 7194210 - Wavelength division multiplexing optical transmission equipment and method of amplifying optical wavelength division multiplexed signals
5. 7116908 - Optical transmission system for substantially equalizing the output signal level among frequency bands and substantially lowering the signal-to-noise ratio