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. Quartet Manufacturing Company (3 from 12 patents)
3 patents:
1. 5662303 - Portable easel having a hollow body
2. 5478040 - Portable easel
3. D352398 - Easel design