Average Co-Inventor Count = 1.00
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. Amgen Inc. (1 from 1,975 patents)
2. Amgen Boulder Inc. (1 from 2 patents)
2 patents:
1. 5935564 - Use of hydrophobic interaction chromatography to purify polyethylene
2. 5747639 - Use of hydrophobic interaction chromatography to purify polyethylene