Average Co-Inventor Count = 1.64
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. Hasbro Industries, Inc. (2 from 48 patents)
2. Other (1 from 832,761 patents)
3 patents:
1. 4364176 - Drawing appliance
2. D265572 - Drawing instrument
3. 4251920 - Drawing apparatus