IPC Subgroup
G02B 3/04 with continuous faces that are rotationally symmetrical but deviate from a true sphere
Introduced: September 1968
Last revised: January 2006
Full Title
Simple or compound lenses > with non-spherical faces > with continuous faces that are rotationally symmetrical but deviate from a true sphere
Classification Context
- Section:
- PHYSICS
- Class:
- OPTICS
- Subclass:
- OPTICAL ELEMENTS, SYSTEMS OR APPARATUS