Average Co-Inventor Count = 2.25
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. Learning Resources, Inc. (3 from 23 patents)
3 patents:
1. 5999339 - Hand-held magnifying device
2. D407423 - Slide viewer
3. D400813 - Teaching scale