Average Co-Inventor Count = 3.33
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. (3 from 233 patents)
3 patents:
1. 9669978 - Gift card holder
2. 9232288 - Article having karaoke record feature and simultaneous playback
3. 8719033 - Greeting card having karaoke record feature and simultaneous playback