Average Co-Inventor Count = 1.20
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. R & D Office Makoto Ltd. (2 from 2 patents)
2. Infinity Systems, Inc. (1 from 14 patents)
3 patents:
1. 4256312 - Turn table device for record players
2. D257534 - Tone-arm
3. D251558 - Tone arm