Granted Patent
Utility
US 5,354,816 · App. 07/996,786
Sulfonated aniline-type copolymer and process for production thereof
Inventors:
Shigeru Shimizu, Takashi Saitoh, Tomio Nakamura
Patented Case
View Patent ↗
Granted: Oct 11, 1994
Filed: Dec 24, 1992
Inventors
Shigeru Shimizu
Takashi Saitoh
Tomio Nakamura
Assignee (at issue)
Nitto Chemical Industry 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.