Average Co-Inventor Count = 2.00
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. Ruhrgas Aktiengesellschaft (2 from 41 patents)
2 patents:
1. 4699122 - Storage water heater system
2. 4557220 - Gas apparatus for producing hot water