Average Co-Inventor Count = 8.00
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. American Greetings Corporation (4 from 423 patents)
4 patents:
1. D778354 - Paddle ball greeting card
2. 8950093 - Electronic greeting cards
3. 8312651 - Electronic greeting cards
4. 7802386 - Electronic greeting cards