Average Co-Inventor Count = 1.43
ph-index = 3
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. Other (3 from 832,843 patents)
5 patents:
1. 5122062 - Electronic teaching apparatus
2. D323860 - Educational game board
3. D318435 - Ruler
4. 4781598 - Instructional apparatus
5. 4664634 - Electric self-teaching apparatus utilizing printed and auditory means