Average Co-Inventor Count = 4.81
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. Robert Boschgmbh (3 from 29,302 patents)
3 patents:
1. 6559578 - Spark plug for an internal combustion engine
2. 5952770 - Spark plug for internal combustion engine
3. 5550424 - Spark plug for internal combustion engines