Average Co-Inventor Count = 6.00
ph-index = 4
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)
5 patents:
1. D917417 - Phonograph greeting card
2. D905655 - Phonograph greeting card
3. D661348 - Greeting card
4. D657817 - Greeting card
5. D649587 - Mini greeting card, envelope and locator