Average Co-Inventor Count = 6.61
ph-index = 3
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. Den Norske Stats Oljeselskap A.s. (3 from 146 patents)
3 patents:
1. 4941511 - Device with a valve function
2. 4852391 - Pipeline vehicle
3. 4852614 - Shut-off device which can be inserted into a pipeline