Average Co-Inventor Count = 2.00
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. Shachihata Industrial Co., Ltd. (4 from 25 patents)
4 patents:
1. D304840 - Marking pen
2. D302175 - Marking pen
3. D301488 - Marking pen
4. D301252 - Marking pen