Average Co-Inventor Count = 3.20
ph-index = 4
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. (4 from 42,485 patents)
4 patents:
1. 5852447 - Character and figure transforming system
2. 5539868 - Character and figure transferring system
3. 5289568 - Apparatus and method for drawing figures
4. 5035624 - Presentation apparatus