Average Co-Inventor Count = 1.33
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. Pentech International Inc. (2 from 11 patents)
2 patents:
1. 5735622 - Writing instrument with a compressible friction coating and method of
2. D337786 - Marking pen