Average Co-Inventor Count = 2.00
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. Pierce Companies, Inc. (2 from 11 patents)
2. Other (1 from 832,761 patents)
3 patents:
1. 4869921 - Image permanence method
2. 4779558 - Image permanence device
3. 4393988 - Spoon lid