Average Co-Inventor Count = 3.43
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. Seiko Epson Corporation (1 from 33,464 patents)
2. Kabushiki Kaisha Suwa Seikosha (1 from 446 patents)
2 patents:
1. 5015523 - Coated synthetic resin lens
2. 4525421 - Surface hard coat for a synthetic resin lens