Average Co-Inventor Count = 2.67
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. Greif Bros. Corporation (2 from 37 patents)
2 patents:
1. 4135657 - Fiber drum and locking rim assembly
2. 3955705 - Plastic drum