Average Co-Inventor Count = 2.25
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. Sony Corporation (3 from 58,130 patents)
3 patents:
1. 6690528 - Recording and reproduction apparatus
2. 6563667 - Cassette deck mechanism for mounting/discharging different size cassettes using a pivoted arm
3. 5640262 - Control system and connecting device