Average Co-Inventor Count = 3.00
ph-index = 1
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. Ngk Spark Plug Company, Limited (1 from 2,606 patents)
2. Toyota Jidosha Kogyo Kabushiki Kaisha (1 from 1,838 patents)
1 patent:
1. 4289990 - Spark plug with a stepped insulator and an inner constriction in the