Granted Patent
Utility
US 5,863,700 · App. 08/939,253
Isolation of novolak resin without high temperature distillation and photoresist composition therefrom
Inventors:
M. Dalil Rahman, Ping-Hung Lu
Patented Case
View Patent ↗
Granted: Jan 26, 1999
Filed: Sep 29, 1997
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.