Average Co-Inventor Count = 2.40
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. Mitsui Petrochemical Industries, Ltd. (4 from 1,008 patents)
4 patents:
1. 5500142 - Piezoelectric ceramics
2. 5079197 - Ferroelectric ceramics
3. 4948767 - Ferroelectric ceramic material
4. 4940681 - Ferroelectric ceramic material