Average Co-Inventor Count = 4.44
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. Kawasaki Steel Corporation (2 from 1,256 patents)
2. Kusakabe Electric & Machinery Co. (1 from 15 patents)
2 patents:
1. 5673579 - Welded steel pipe manufacturing apparatus and method
2. 5301869 - Machine for manufacturing welded steel pipes and method for handling the