Average Co-Inventor Count = 4.00
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. Bridgestone Corporation (2 from 5,119 patents)
2. Ikeda Bussan Co. Ltd. (2 from 317 patents)
2 patents:
1. 4777189 - Production of polyurethane foam
2. 4696952 - Production of polyurethane foam