Average Co-Inventor Count = 2.67
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. Zahnradfabrik Friedrichshafen, Ag. (3 from 416 patents)
2. Zf Friedrichshafen Ag (1 from 3,430 patents)
4 patents:
1. 5799259 - Vehicle with steerable front and rear wheels
2. 5107752 - Rotary gate valve for hydraulic servo-assisted steering systems
3. 5099939 - Multi-axle steering system
4. 5086687 - Rotary slide valve for hydraulic auxiliary power steering