Average Co-Inventor Count = 5.00
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. Rotring-Werke Riepe Kg (1 from 8 patents)
2. Aristo-Werke Dennert & Pape Kg (1 from 1 patent)
1 patent:
1. 4173020 - Automatic drafting instrument with stylographic pen