Average Co-Inventor Count = 4.00
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. Hallmark Cards, Inc. (4 from 233 patents)
4 patents:
1. 11004361 - Flexible drive shaft for greeting cards and the like
2. 10515568 - Flexible drive shaft for greeting cards and the like
3. 10089904 - Flexible drive shaft for greeting cards and the like
4. 9830836 - Flexible drive shaft for greeting cards and the like