Average Co-Inventor Count = 6.00
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. Nippon Oil Company (1 from 690 patents)
2. Nippon Petrochemicals Company, Limited (1 from 327 patents)
3. Nippon Hodo Co., Ltd. (1 from 11 patents)
1 patent:
1. 5262453 - Cushion or trackbed material for use in riding-ground