Average Co-Inventor Count = 2.57
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. The Parker Pen Company (3 from 29 patents)
3 patents:
1. D285936 - Push button ball point pen
2. D285937 - Push button mechanical pencil
3. D279383 - Ball point writing instrument