Average Co-Inventor Count = 1.33
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. North States Industries, Inc. (3 from 22 patents)
2. Hartzell Manufacturing, Inc. (1 from 4 patents)
4 patents:
1. 4838205 - Bird feeder with scatter restricting feeding tray
2. 4712773 - Multiple panel play area
3. 4677791 - Adjustable gate for doorways
4. 4201298 - Storage case