Average Co-Inventor Count = 4.00
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. Seiko Epson Corporation (1 from 33,511 patents)
2. World Munsell Co., Ltd. (1 from 1 patent)
1 patent:
1. 6135595 - Eyeglass lenses for correcting color vision