Average Co-Inventor Count = 2.93
ph-index = 4
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. Duncan Industries (4 from 5 patents)
4 patents:
1. D461728 - Parking meter housing
2. 6354425 - Housing for parking meter
3. 6230868 - System for metering multiple parking spaces
4. D431788 - Parking meter