US PATENT SUBCLASS 351 / 57
.~ With auxiliary lenses movable in and out of the optical path (e.g., clip-on type attachments)

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

41  DF  SPECTACLES AND EYEGLASSES {29}
57.~ With auxiliary lenses movable in and out of the optical path (e.g., clip-on type attachments) {1}
58  DF  .~.~> Spring biased or secured by friction members

DEFINITION

Classification: 351/57

(under subclass 41) Subject matter wherein supplemental lenses or glasses without temples are movably attached to permanent reading or farsight main spectacles.

(1) Note. The above noted supplemental glasses may comprise U-shape or half moon lenses below eye level. They may be pivotable or magnetically attached to normal spectacles. The subject matter does not include supplemental glasses attached to frames without permanent lenses. See subclass 59 for this subject matter. The lenses may be plain glass as for protecting purposes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

44+, for eyeglasses and spectacles with antiglare or shading structure.

61, for spectacles with U-shape or half-moon lenses below eye level.

SEE OR SEARCH CLASS

359, Optics: Systems (Including Communication) and Elements, 481, for binocular loupes and subclass 816 for monocular loupes.