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United States Utility Patents
4,990,320 - 4,990,329

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NumberTitle
4,990,320 Process for purifying hydrogen fluoride
4,990,321 Method for recovering hydrobromic acid and methanol
4,990,322 NaCl:OH color center laser
4,990,323 Composition for reduction-reoxidation type semiconductive ceramic capacitor
4,990,324 Method for producing two-component or three-component lead zirconate-titanate
4,990,325 Process for synthesis of beryllium chloride dietherate
4,990,326 Method for detecting blood platelets
4,990,327 Desensitizing dental composition
4,990,328 Anticalculus compositions
4,990,329 Composition for treating oral diseases



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