Average Co-Inventor Count = 2.57
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. The W. B. Marvin Manufacturing Company (3 from 21 patents)
3 patents:
1. 7013080 - Space heater with area light source
2. 6810205 - Space heater and light source
3. 6167196 - Radiant electric heating appliance