Average Co-Inventor Count = 1.00
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. Nippon Oil Seal Industry Co., Ltd. (2 from 25 patents)
2 patents:
1. 3977125 - Device for sealing steel doors of coke oven
2. 3952454 - Device for sealing doors of coke oven