Average Co-Inventor Count = 2.40
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. Ernst Leitz Wetzlar Gmbh (1 from 168 patents)
2. Leybold Vakuum Gmbh (1 from 53 patents)
2 patents:
1. 6263677 - Multistage low-temperature refrigeration machine
2. 4859896 - Piezoelectric precision positioning device