Average Co-Inventor Count = 2.44
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. Rinnai America Corporation (4 from 27 patents)
2. American Water Heater Company (3 from 19 patents)
7 patents:
1. 9810449 - Methods and apparatus for heating air with hot water
2. 9335066 - Water heating system
3. 8662404 - Methods and apparatus for heating air with hot water
4. 8353463 - Methods and apparatus for heating air with hot water
5. 7380522 - Energy saving water heater
6. 7203418 - Electric water heater with hot water outlet dip tube
7. 7159540 - Water heater with air intake and exhaust system