Average Co-Inventor Count = 1.14
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. Sanyo Electric Co., Ltd. (4 from 8,780 patents)
4 patents:
1. 8295959 - Sound-recording apparatus
2. D634727 - Digital voice recorder
3. D633080 - Charger for IC recorder with speaker
4. D592635 - Digital voice recorder