Average Co-Inventor Count = 5.04
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. Hitachi, Ltd. (2 from 42,517 patents)
2. Hitachi Construction Machinery Co., Ltd. (2 from 1,504 patents)
3. Kabushiki Kaisha Toshiba (1 from 52,766 patents)
5 patents:
1. 7057361 - Inverter control device and electric vehicle thereof
2. D452758 - Vacuum cleaner
3. D396234 - Optical transmission equipment
4. D350294 - Control unit for an ultrasonic flaw detector
5. D349464 - Ultrasonic flaw detector system