Average Co-Inventor Count = 1.33
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. Nippon Columbia Co., Ltd. (2 from 44 patents)
2 patents:
1. 6625097 - Recorded medium reproducing apparatus
2. 5293362 - Optical disc play-back device of the carousel type, having a mechanism