Average Co-Inventor Count = 1.33
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. Hans Friedrich Hefendehl (1 from 5 patents)
2 patents:
1. D299011 - Table clock
2. D277874 - Combined writing board and pen holder