Documents 1.System and Method of Producing Bisphenol-A (BPA) Using Direct Crystallization of BPA in a Single.....

US007163582B2 (12) Umted States Patent (10) Patent N0.2 US 7,163,582 B2 OâYoung et a]. (45) Date of Patent: Jan. 16, 2007 (54) SYSTEM AND METHOD OF PRODUCING 3,164,640 A…