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. North American Foreign Trading Corporation (3 from 18 patents)
3 patents:
1. D276733 - Teaching machine
2. D271030 - Preprogrammed toy sound generator
3. D271029 - Quizzer toy