Average Co-Inventor Count = 4.44
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. Komatsu Corporation (2 from 2,730 patents)
2. Maeda Corporation Limited (1 from 14 patents)
3. Hazama Corporation (1 from 8 patents)
4. Sato Kogyo Co., Ltd. (1 from 8 patents)
2 patents:
1. 5931601 - Tunnel excavator
2. 5915790 - Tunnel boring machine