Granted Patent
Utility
US 6,238,849 · App. 09/481,063
Cyclic ureas in photoresist developers
Inventors:
John Anthony Marsella, Kevin Rodney Lassila
Patented Case
View Patent ↗
Granted: May 29, 2001
Filed: Jan 11, 2000
Inventors
John Anthony Marsella
Kevin Rodney Lassila
Assignee (at issue)
Air Products and Chemicals, Inc.
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.