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. Nkk Corporation (1 from 614 patents)
2. Marubeni Tubulars, Inc. (1 from 6 patents)
1 patent:
1. 5358289 - Buttress-threaded tubular connection