Average Co-Inventor Count = 2.00
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. Nishikawa Co., Ltd. (4 from 12 patents)
2. Nishikawa Sangyo Co., Ltd. (1 from 4 patents)
5 patents:
1. D979985 - Core for a pillow
2. D978573 - Core for a pillow
3. D971424 - Core for a pillow
4. D971425 - Core for a pillow
5. D820005 - Core for a pillow