Average Co-Inventor Count = 2.40
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. Minnesota Mining and Manufacturing Company (3 from 7,865 patents)
3 patents:
1. 4328181 - Indicator material
2. 4155358 - Respirator
3. 4133309 - Sorbent material and a respirator containing the sorbent material