IPC Subgroup
G02B 3/1 Bifocal lenses; Multifocal lenses
Introduced: September 1968
Last revised: January 2006
Full Title
Simple or compound lenses > Bifocal lenses; Multifocal lenses
Classification Context
- Section:
- PHYSICS
- Class:
- OPTICS
- Subclass:
- OPTICAL ELEMENTS, SYSTEMS OR APPARATUS