US PATENT SUBCLASS 351 / 163
.~.~ With light filtering means

Current as of: June, 1999
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351 /   HD   OPTICS: EYE EXAMINING, VISION TESTING AND CORRECTING

41  DF  SPECTACLES AND EYEGLASSES {29}
159  DF  .~ Ophtahalmic lenses or blanks {10}
163.~.~ With light filtering means {2}
164  DF  .~.~.~> Multifocal
165  DF  .~.~.~> With sections of different light absorption

DEFINITION

Classification: 351/163

(under subclass 159) Subject matter wherein the lenses have the property of absorption of rays in portions of the visible or invisible spectrum, or are combined with additional structure having this property.

(1) Note. For classification here an ophthalmic lens must be included in the claims specifically or broadly if the disclosure relates to such a lens. Light filters, per se, which may be used with spectacle lenses are classified in Class 359, Optics: Systems (Including Communication) and Elements, subclasses 885+. These lenses may be polarizing.

SEE OR SEARCH THIS CLASS, SUBCLASS:

44, for spectacles with antiglare or shading.

SEE OR SEARCH CLASS

359, Optics: Systems (Including Communication) and Elements, 483+, for light polarizers and subclasses 885+ for optical filters. See also (1) Note above.

501, Compositions: Ceramic,

60+, for lead containing glass compositions.