Average Co-Inventor Count = 4.61
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 42,496 patents)
2. Hitachi Asahi Electronics Co., Ltd. (1 from 5 patents)
3 patents:
1. 6978256 - Method and apparatus for selling digital contents, processing program thereof and recording medium for the program
2. 6886744 - Automatic vending apparatus involving contract and vending system
3. 6594646 - Method and apparatus for selling digital contents, processing program thereof and recording medium for the program