Granted Patent
Utility
US 4,897,457 · App. 07/233,820
Novel fluorine-containing cyclic polymer
Inventors:
Masaru Nakamura, Isamu Kaneko, Kazuya Oharu, Gen Kojima, Masashi Matsuo, Shunichi Samejima, Motoi Kamba
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Aug 10, 1988
Inventors
Masaru Nakamura
Isamu Kaneko
Kazuya Oharu
Gen Kojima
Masashi Matsuo
Shunichi Samejima
Motoi Kamba
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.