Granted Patent
Utility
US 5,356,739 · App. 08/007,818
Stainproof protector made from fluorine-containing aliphatic cyclic polymer for preventing staining of lithographic masks
Inventors:
Toru Kawasaki, Masao Unoki, Masaru Nakamura
Patented Case
View Patent ↗
Granted: Oct 18, 1994
Filed: Jan 22, 1993
Inventors
Toru Kawasaki
Masao Unoki
Masaru Nakamura
Assignee (at issue)
ASAHI GLASS CO., LTD.
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.