Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid anhydrides
Reexamination Certificate
2007-12-04
2007-12-04
Eyler, Yvonne (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid anhydrides
Reexamination Certificate
active
10553451
ABSTRACT:
The present invention provides a process for preparing crystalline parahydroxybenzoic acid anhydride, comprising the step of precipitating and isolating parahydroxybenzoic acid in an aqueous solvent at a temperature equal to or above the transition temperature of parahydroxybenzoic acid.
REFERENCES:
patent: 4814498 (1989-03-01), Cocco
patent: 2002-316969 (2002-10-01), None
Izumichi Nobutaka
Kitayama Masaya
Kittaka Masaharu
Ueno Ryuzo
Eyler Yvonne
Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo
Lao M Louisa
Sughrue & Mion, PLLC
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