Average Co-Inventor Count = 3.00
ph-index = 1
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. Bergwerksverband Gmbh (1 from 231 patents)
2. Ruhrkohle Ag (1 from 69 patents)
1 patent:
1. 5560437 - Telemetry method for cable-drilled boreholes and method for carrying it