Average Co-Inventor Count = 3.60
ph-index = 3
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. Shimizu Construction Co., Ltd. (3 from 116 patents)
3 patents:
1. 4838150 - Clean room
2. 4741333 - Dust-free garment
3. 4345431 - Exhaust gas cleaning system for diesel engines