Average Co-Inventor Count = 6.13
ph-index = 3
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. (4 from 42,517 patents)
4 patents:
1. D311929 - Facsimile transceiver
2. D304874 - Facsimile transceiver
3. D304724 - Facsimile transceiver
4. D304578 - Facsimile transceiver