Average Co-Inventor Count = 2.00
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. Propper Manufacturing Co., Ltd. (1 from 49 patents)
2. Optotechnik Heine Kg (1 from 4 patents)
1 patent:
1. 3948585 - Ophthalmoscope examination pattern having slit and surrounding ring