Average Co-Inventor Count = 4.20
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. American Greetings Corporation (1 from 423 patents)
2. Tonka Corporation, Kenner Division (1 from 2 patents)
2 patents:
1. 4895548 - Collapsible construction set
2. D288702 - Toy oven