×

Method for manufacturing polycarbonate for optical use

  • US 6,197,917 B1
  • Filed: 08/18/1999
  • Issued: 03/06/2001
  • Est. Priority Date: 09/02/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for manufacturing an optical polycarbonate, by the melt polycondensation of a bisphenol and a carbonic diester, whereina molten mixture of a bisphenol and a carbonic diester is first filtered through a membrane filter made of a fluororesin, and melt polycondensation is subsequently conducted.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×