Average Co-Inventor Count = 2.67
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. Ntn Corporation (2 from 2,464 patents)
2. Sumitomo Chemical Company, Limited (1 from 6,896 patents)
2 patents:
1. 5518781 - Stripping fingers for copying machine
2. 5435348 - Valve assembly