Average Co-Inventor Count = 4.74
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. Hitachi, Ltd. (3 from 42,485 patents)
2. Honda Motor Co., Ltd. (1 from 21,831 patents)
3. Nippon Steel Materials Co., Ltd. (1 from 19 patents)
4. Hitachi High-tech Control Systems Corporation (1 from 1 patent)
4 patents:
1. 7772149 - Exhaust gas purification apparatus for an internal combustion engine and a catalyst for purifying exhaust gas
2. 7364917 - Apparatus and method for detecting vaporized gas
3. 6940067 - Hazardous material detection system
4. 6806450 - Hazardous material detection system