Granted Patent
Utility
US 6,455,234 · App. 10/024,893
Acetylenic diol ethylene oxide/propylene oxide adducts and their use in photoresist developers
Inventors:
Kevin Rodney Lassila, Paula Ann Uhrin, Joel Schwartz
Patented Case
View Patent ↗
Granted: Sep 24, 2002
Filed: Dec 18, 2001
Inventors
Kevin Rodney Lassila
Paula Ann Uhrin
Joel Schwartz
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.