Having made and sold, like others, a Blue-Blocker dye for 21 years I just run across a US patent issued in 2005. Interesting that the patent office lets somebody issue a patent on a article that been around forwever. Here is the abstract:
Inventor
US Patent Issued on October 18, 2005
Estimated Patent Expiration Date: April 25, 2023
Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Abstract
An article of externally-worn eye wear, including, but not limited to, eyeglasses, sunglasses, goggles, and contact lenses. The eye wear includes a wavelength transmission blocker for blocking substantially all of light wavelengths throughout the [COLOR=#f26522! important][COLOR=#f26522! important]blue [COLOR=#f26522! important]light[/COLOR][/COLOR][/COLOR] spectrum. The wavelength transmission blocker protects the eyes against the harmful effect of the blocked light. Also, since the eye wear is worn externally from the eye, and the user can remove the eye wear, the user can selectively block the light. As such, the eye wear can be worn to block potentially harmful light, or the eye wear can be removed if blocking the light would cause other hazards.
See whole transcript at : http://www.patentstorm.us/patents/6955430/fulltext.html
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