Average Co-Inventor Count = 2.18
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. Learning Resources, Inc. (2 from 23 patents)
2. Other (1 from 832,718 patents)
3. Eta/cuisenaire (1 from 1 patent)
4 patents:
1. 7018210 - Method and apparatus for teaching and learning reading
2. 6086105 - Book for packaging activity pieces in an activity kit
3. 5851118 - Digital and analog teaching clock
4. 5597308 - Assembly including interlocking components for teaching mathematical