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. Plessey Overseas Limited (1 from 271 patents)
2. The Plessey Company Plc (1 from 36 patents)
2 patents:
1. 4990287 - Optical devices utilizing photochromic compounds
2. 4834511 - Optical resonant assembly