Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1997-05-12
1999-11-02
Sugarman, Scott J.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351163, G02C 710
Patent
active
059756969
ABSTRACT:
Methods for quickly and inexpensively producing photochromic non-prescription (e.g., sunglasses, safety glasses, reading glasses, etc.), prescription, multifocal and progressive plastic optical quality eyeglass, and more particularly, a simple and inexpensive yet rapid and high quality method for rendering one or both surfaces of a lens photochromic. The invention further concerns lenses produced by the method. The method comprises providing a layer of a polar liquid in a vessel, dissolving a photochromic dye in a non-polar solvent having a lower specific gravity than a polar liquid to form a dye carrier, providing a photochromic dye dissolved in non-polar solvent into a vessel as a distinct upper layer on top of a polar liquid lower layer to form a two-layer bath; immersing a lens to be rendered photochromic into a bath such that at least part of a lens passes through the upper layer, into the lower layer, and back out through the upper layer, drying the lens to evaporate solvent and form a deposit of photochromic dye on the lens, and heat treating the lens to cause the deposited dye to firmly adhere to the lens.
REFERENCES:
patent: 5552090 (1996-09-01), Van Gemert et al.
patent: 5576055 (1996-11-01), Tagaya et al.
LandOfFree
Process for rendering plastic substrate photochromic does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for rendering plastic substrate photochromic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for rendering plastic substrate photochromic will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2125940