Back to results
US 5,475,152 AGranted
Process and composition
AssigneeGeneral Electric Company and Sulzer Canada, Inc.
InventorsGaylord M. Kissinger, Nicholas P. Wynn
Life of this patent
Estimating the term…
Abstract
A method comprising purifying impure bisphenol-A by fractional melt crystallization in a falling film dynamic crystallizer.
Claims3
Orthorhombic crystalline bisphenol-A of a purity of at least 99.5% by weight.
Orthorhombic crystalline bisphenol-A essentially free of water and organic solvent.
Orthorhombic crystalline bisphenol-A prepared by fractional melt crystallization of melted crude bisphenol-A in a falling film dynamic crystallizer.
Dependencies are inferred from the claim text.