Average Co-Inventor Count = 1.75
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 42,488 patents)
2 patents:
1. 4909649 - Thermal transfer recording apparatus
2. 4901090 - Inked sheet cassette and thermal transfer-type recording apparatus