Average Co-Inventor Count = 1.00
ph-index = 3
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. (3 from 44 patents)
3 patents:
1. 5790488 - Optical disk having both constant linear and constant angular velocity
2. 5757750 - Optical disk having both constant linear and constant angular velocity
3. 5687148 - Optical disk having both constant linear and constant angular velocity