Average Co-Inventor Count = 7.63
ph-index = 4
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 42,485 patents)
5 patents:
1. 7231130 - Magnetic recording/reproducing apparatus for searching programs recorded on magnetic tape
2. 6895393 - Electronic book distributing system by use of purchase certificate and devices therefor
3. 6389217 - Magnetic recording/reproducing apparatus for searching programs recorded on magnetic tape
4. 6038366 - Magnetic recording/reproducing apparatus for search programs recorded on
5. 5761371 - magnetic recording/reproducing apparatus for searching programs recorded