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| Number | Title | Issue Date |
| 7282597 | Ascorbic acid derivatives and skin-whitening cosmetics It is an object to provide an L-ascorbic acid derivative which can keep the L-ascorbic acid stable to heat and light and thus has a long shelf life, which is high in permeability into the skin, which can be quickly hydrolyzed by phosphatase, an enzyme that is ubiqui... | 10/16/2007 |
| 5175300 | Process for preparing pyridine-2,3-dicarboxylic acid compounds A process for preparing pyridine-2,3-dicarboxylic acid compounds of the following formula, which comprises preparing -halo-oxalacetic acid diesters by reacting oxalacetic acid diester alkali metallic salts with an acid and a halogenating agent or b... | 12/29/1992 |
| 4973695 | Process for preparing pyridine-2,3-dicarboxylic acid compounds A process for preparing pyridine-2,3-dicarboxylic acid compounds of the following formula: ##STR1## wherein R1 and R3 are, identical or different, each a hydrogen atom or a lower alkyl group, R2 is a hydrogen atom, a ... | 11/27/1990 |
| 4670581 | Biphenyl compounds and process for producing the same New biphenyl compounds and a process for producing them are provided. These new compounds have an acyloxy group in the 2- or 4-position of the biphenyl and an acyl hydroxyalkyl, hydroxyalkenyl or vinyl group in the 4'-position of the biphenyl or, alternat... | 06/02/1987 |
| 4465878 | Process for producing 4',4-dihydroxydiphenyl A process for producing 4,4'-dihydroxydiphenyl which comprises subjecting to alkali fusion 1 mol of 4,4'-diphenyldisulfonic acid and/or potassium 4,4'-diphenyldisulfonate together with 4 to 10 mol of potassium hydroxide and 0.1 to 2 mol of potassium sulfa... | 08/14/1984 |
| 4382896 | Process for producing 4,4'-diphenyldisulfonic acid and its monopotassium salt A process for producing 4,4'-diphenyldisulfonic acid is disclosed, which comprises the steps of adding a sulfonating agent to molten diphenyl at a temperature within a range of 130° to 145° C., and when crystallization commences of 4,4'-diphenyldisulfon... | 05/10/1983 |
| 4324742 | Process for separation of naphthalenedisulfonic acids A process for separating 1,6-naphthalenedisulfonic acid, 2,6-naphthalenedisulfonic acid or 2,7-naphthalenedisulfonic acid selectively from reaction mixtures obtained by disulfonation of naphthalene under different reaction conditions is disclosed. For exa... | 04/13/1982 |
| 4060559 | Process for preparing O-phenylphenol A process for preparing o-phenylphenol by dehydrogenating at least one of cyclohexanone dimer and o-cyclohexylphenol in the presence of a catalyst, characterized in that the catalyst comprises a metal oxide carrier, and at least one of alkali metal salts ... | 11/29/1977 |
