| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 549223000 | Xanthene ring system having a benzene ring bonded directly thereto para to the xanthene ring oxygen, wherein the carbon of a -COO- group is bonded directly to the benzene ring ortho to its position of attachment to the xanthene ring system, and spirolactone derivatives thereof (e.g., fluoresceins, chlorofluorans, etc.) | 6 |
| 20100179334 | HIGH PURITY PHTHALEIN DERIVATIVES AND METHOD FOR PREPARING SAME - High purity phthalein derivatives are useful for medical applications and/or in the field of biotechnology. The phthalein derivatives are prepared by a method whereby a phthalic anhydride derivative is condensed with a naphthol or phenol derivative in an organic acid ester and the crystals of the resulting condensate are converted by action of a strong acid or one of its precursors in anhydrous medium. | 07-15-2010 |
| 20110077415 | UV Excitable Fluorescent Energy Transfer Dyes - Novel energy transfer dyes which can be used with shorter wavelength light sources are provided. These dyes include a donor dye with an absorption maxima at a wavelength between about 250 to 450 nm and an acceptor dye which is capable of absorbing energy emitted from the donor dye. One of the energy transfer dyes has a donor dye which is a member of a class of dyes having a coumarin or pyrene ring structure and an acceptor dye which is capable of absorbing energy emitted from the donor dye, wherein the donor dye has an absorption maxima between about 250 and 450 nm and the acceptor dye has an emission maxima at a wavelength greater than about 500 nm. | 03-31-2011 |
| 20110251404 | REAGENT FOR MEASUREMENT OF ACTIVE OXYGEN - A compound represented by the formula (I) (R | 10-13-2011 |
| 20120220787 | PROCESS FOR THE PREPARATION OF 5-/6-NITROFLUORESCEIN - A process for the preparation of a mixture of 3′,6′-dihydroxy-6-nitrospiro[2-benzofuran-3,9′-xanthene]-1-one and 3′,6′-dihydroxy-5-nitrospiro[2-benzofuran-3,9′- xanthene]-1-one comprising the steps of:- (a) reacting 4-nitrophthalic acid or 4-nitrophthalic anhydride with benzene-1,3-diol in methanesulphonic acid; (b) quenching the reaction in step (a) with a solvent to precipitate product; (c) isolating the precipitate; (d) heating the precipitate in water in order to hydrolyse any methansulphonic acid ester present. | 08-30-2012 |
| 20140343296 | Process for the Synthesis of 4,5,6,7-tetrachloro-3',6'-dihydroxy-2',4',5',7'-tetraiodo-3H-spiro[isoben- zofuran-1,9'-xanthen]-3-one (Rose Bengal) and Related Xanthenes - A new process for the manufacture of iodinated xanthenes in high purity includes a cyclization step followed by an iodination step. No extraction, chromatographic or solvent concentration steps are required, and the intermediate as well as final compounds are isolated via filtration or similar means. The process requires a single organic solvent, and the steps are completed at temperatures below 100° C. The exclusion of chloride ions, of chloride free-radicals, hypochlorite ions, or hypochlorous acid as reagents or from reagents that may generate these species in situ in the presence of oxidants, prevents undesirable impurity formation. Several new compounds have been conceived and isolated using these methods. These new compounds are also formed into new medicaments. | 11-20-2014 |
| 549225000 | Nitrogen bonded directly to the xanthene ring system (e.g., rhodols, aminofluorans, etc.) | 1 |
| 549226000 | Plural nitrogens bonded directly to the xanthene ring system (e.g., 2,6 diaminofluorans, etc.) | 1 |
| 20120149918 | PROCESS FOR THE MANUFACTURE OF 3-DIBUTYLAMINO-6-METHYL-7-ANILINOFLUORAN - A process for the preparation of 3-dibutylamino-6-methyl-7-anilinofluoran and a heating- and pressure sensitive recording material are claimed. | 06-14-2012 |
