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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 6719925 | Naphthopyrans with a heterocycle in the 5, 6-position, preparation, and (co)polymer compositions and matrices containing them The present invention relates to novel compounds of the naphthopyran type with a fused heterocycle in the 5,6-position. These compounds have formula (I) or (II) given below: These compounds (I) or (II) have valuable phot... | 04/13/2004 |
| 6426023 | Benzopyrans annelated in C7-C8 with an aromatic heterocycle and compositions and (CO)polymer matrices containing them The invention relates to novel benzopyran-type compounds having an aromatic heterocycle annelated in position 7,8 and a carbocycle annelated in position 5,6. These compounds have the formula (I) given below: ##STR1## These compounds (I) have interesting p... | 07/30/2002 |
| 6363748 | Method of making protective filter lens An ophthalmic, protective, filter lens, and a method of producing such lens, the lens having a ratio of Z and Y tristimulus values between 0.25-0.40, a dominant wavelength between 570-580 nm. on a color mixture diagram, a sharp transmission drop between 4... | 04/02/2002 |
| 6329482 | Polymerizable compositions based on difunctional monomers, resins and ophthalmic articles containing same The object of the present invention is a radically polymerisable composition comprising a mixture of at least: one or more (meth)acrylate difunctional monomer(s) of type (a): of formula (A) and/or of formula (A'); and one or more alkenic difunctional mono... | 12/11/2001 |
