Average Co-Inventor Count = 4.00
ph-index = 1
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. Stt Inc. (2 from 9 patents)
2. Nippon Piston Ring Co., Ltd. (1 from 230 patents)
3. Nippon Piston Co., Ltd (1 from 1 patent)
2 patents:
1. 8181968 - Piston ring
2. 8088496 - Piston ring