Average Co-Inventor Count = 1.25
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 Inc. (3 from 72 patents)
2. Shachihata Industrial Co., Ltd. (2 from 25 patents)
5 patents:
1. D452261 - Changeable character stamp
2. D441009 - Changeable character stamp
3. D408052 - Stamp receiver
4. D294600 - Ballpoint pen
5. D294599 - Marking pen