Average Co-Inventor Count = 1.50
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. Manten Co., Ltd. (2 from 3 patents)
2 patents:
1. 4457528 - Wheelchair
2. 4293144 - Protective handrail for folding baby carriage