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PCE
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DIFF Subgroup
G02B 3/04

with continuous faces that are rotationally symmetrical but deviate from a true sphere

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Simple or compound lenses > with non-spherical faces > with continuous faces that are rotationally symmetrical but deviate from a true sphere

CPC:

Simple or compound lenses > with non-spherical faces (G02B3/10 takes precedence) > with continuous faces that are rotationally symmetrical but deviate from a true sphere

No child classifications to compare. This is a leaf node in both IPC and CPC.