Average Co-Inventor Count = 2.07
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. Levenger Company (3 from 32 patents)
3 patents:
1. D490856 - Book annotation station
2. D490453 - Ibis magnifier
3. D410493 - Eraser