Granted Patent
Utility
US 6,090,533 · App. 09/186,909
Isolation of novolak resin without high temperature distillation and photoresist composition therefrom
Inventors:
M. Dalil Rahman, Ping-Hung Lu
Patented Case
View Patent ↗
Granted: Jul 18, 2000
Filed: Nov 6, 1998
Inventors
M. Dalil Rahman
Ping-Hung Lu
Assignee (at issue)
Clariant Finance (BVI) Limited
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.