Average Co-Inventor Count = 2.67
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. Unicharm Corporation (3 from 1,645 patents)
2. Richell Corporation (1 from 10 patents)
4 patents:
1. D728172 - Litter box for pets
2. D728173 - Litter box for pets
3. 8210127 - Two-way door pet restriction device
4. D652587 - Pet toilet