IPC Subgroup
G02B 3/08 with discontinuous faces, e.g. Fresnel lens
Introduced: September 1968
Last revised: January 2006
Full Title
Simple or compound lenses > with non-spherical faces > with discontinuous faces, e.g. Fresnel lens
Classification Context
- Section:
- PHYSICS
- Class:
- OPTICS
- Subclass:
- OPTICAL ELEMENTS, SYSTEMS OR APPARATUS