Average Co-Inventor Count = 5.09
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. (2 from 42,535 patents)
2. Hitachi Microcomputer Engineering, Ltd. (1 from 149 patents)
3. Hitachi Video Eng. Inc. (1 from 9 patents)
4. Hitachi Microcomputer Eng. Co. (1 from 1 patent)
2 patents:
1. 4737864 - Still picture recording system with noise detection and frame counting
2. 4494056 - Motor driving circuit