US PATENT SUBCLASS 359 / 667
.~.~ With gas
Current as of:
June, 1999
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359 /
HD
OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS
642
DF
LENS
{32}
665
DF
.~ Fluid {2}
667
.~.~ With gas
DEFINITION
Classification: 359/667
With gas:
(under subclass 665) Subject matter wherein the refractive material is a transparent gas.