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. Parker Manufacturing Co. (2 from 28 patents)
2 patents:
1. 4286904 - Wood bit
2. 3997279 - Drill bit