Novel, important upgrade of the already granted patent has been developed. It is based on a novel/ proprietary orientation of the intrinsic positive in-plane (a-plate) birefringence of otherwise negative-birefringent (negative C-plate) compensation layer. This novel technical solution improves for almost a factor of 2 the efficiency of angular compensation by means of the negative c-plate compensation layer, already covered by the granted US patent 8,026,998 (Continuation in part patent application with USPTO # 13/208,378
COBISS.SI-ID: 25659687
The project leader, IJS, is in fact also the author of the two most important novel testing methods to be introduced in the new ISO Standard to come. These tests (angular dependence of the light attenuation and light sensitivity) will impotantly affect the quality of the personal protection. Within the scope of the "sensitivity test" IJS developed also an "artificial plasma light source, which is presently in the last phase of international expert acception as an ISO Standard light source for welding.
COBISS.SI-ID: 25656871