Average Co-Inventor Count = 3.73
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. (7 from 233 patents)
7 patents:
1. 11642906 - Greeting card having audio recording capabilities with trial mode feature
2. 11250630 - Immersive story creation
3. 10870306 - Greeting card having audio recording capabilities with trial mode feature
4. 10486453 - Greeting card having audio recording capabilities with trial mode feature
5. 10071590 - Greeting card having audio recording capabilities with trial mode feature
6. 9232288 - Article having karaoke record feature and simultaneous playback
7. 8719033 - Greeting card having karaoke record feature and simultaneous playback