Average Co-Inventor Count = 3.10
ph-index = 5
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. Pullman-holt Corporation (3 from 3 patents)
2. Browning Ferris Industries (2 from 10 patents)
5 patents:
1. 6363574 - Vacuum cleaner
2. 6219880 - Vacuum cleaner
3. D422386 - Vacuum cleaner
4. D335374 - Dolly
5. D333898 - Waste container