Average Co-Inventor Count = 2.40
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. The Pilot Ink Co., Ltd. (2 from 175 patents)
2 patents:
1. 7189133 - Reversibly metachromatic toy
2. 7014525 - Movable toy and movable toy set for the same