Average Co-Inventor Count = 3.84
ph-index = 3
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. Hoya Corporation (3 from 2,528 patents)
2. Other (1 from 832,718 patents)
4 patents:
1. 6736506 - Eyeglasses made-to-order system
2. 6638573 - Spectacles frame surface treatment method
3. 6533418 - System for making spectacles to order
4. 6340226 - Spectacles accommodating interchangeable/replaceable lens