Average Co-Inventor Count = 2.00
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. Aiphone Co., Ltd. (2 from 78 patents)
2 patents:
1. D578993 - Portable intercom with a TV monitor
2. D561734 - Interphone with a TV monitor