Average Co-Inventor Count = 3.00
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. Yoshinaga Prince Company Limited (6 from 17 patents)
6 patents:
1. D313041 - Ball-point pen
2. D308888 - Ball-point pen
3. D308226 - Ball-point pen
4. D306457 - Ball-point pen
5. D305910 - Ball-point pen
6. D305776 - Ball-point pen