Average Co-Inventor Count = 3.00
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. Texas Instruments Corporation (2 from 29,256 patents)
2 patents:
1. 4441399 - Interactive device for teaching musical tones or melodies
2. 4439161 - Taught learning aid