Granted Patent
Utility
US 5,053,539 · App. 07/642,338
Methylene-crosslinked polyarylamine and process for preparing same
Inventors:
Naoyuki Yano, Tatsuya Nagayoshi, Takashi Nagou, Zunzi Tashima, Noritoshi Ishida, Hiroyuki Itoh, Katsuyuki Nagamatsu
Patented Case
View Patent ↗
Granted: Oct 1, 1991
Filed: Jan 17, 1991
Inventors
Naoyuki Yano
Tatsuya Nagayoshi
Takashi Nagou
Zunzi Tashima
Noritoshi Ishida
Hiroyuki Itoh
Katsuyuki Nagamatsu
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.