Average Co-Inventor Count = 3.83
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. Zf Friedrichshafen Ag (3 from 3,428 patents)
3 patents:
1. 8727820 - Hybrid drive system for a ship
2. 8690616 - Ship propulsion system
3. 8584609 - Tapered tunnel for tunnel thrusters