Average Co-Inventor Count = 3.00
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. Niigata Engineering Co., Ltd. (3 from 45 patents)
3 patents:
1. 4636701 - System for controlling rotation of rotary mechanism in Z-type propulsion
2. 4611549 - Rotation control system for Z-type propulsion apparatus
3. 4610214 - Rotation control system for Z-type propulsion apparatus