Average Co-Inventor Count = 2.82
ph-index = 4
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 (4 from 58,130 patents)
4 patents:
1. 5233644 - Cordless telephone with actuation of off-hook condition by operation of
2. 5220594 - Cordless telephone system having a telephone answering machine function
3. 4720855 - Telephone apparatus
4. 4700377 - Selectively actuable electronic apparatus