Average Co-Inventor Count = 1.20
ph-index = 7
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. (9 from 25 patents)
9 patents:
1. D331940 - Felt-tipped pen
2. D294600 - Ballpoint pen
3. D294599 - Marking pen
4. D286546 - Felt tip pen
5. D275687 - Rotary stamp
6. D268187 - Rotary stamp
7. D265741 - Felt pen
8. D260656 - Felt pen
9. D260657 - Felt pen