Granted Patent
Utility
US 4,795,795 · App. 06/828,530
Catalytic preparation of polyamide or polyamide-polymide with N,N'-dimethyl alkylene urea solvent
Inventors:
Masahiro Kouno, Kazumi Mizutani, Masanori Osawa, Kohei Shizuka, Toshihiro Toyoda, Hiromi Nakano
Patented Case
View Patent ↗
Granted: Jan 3, 1989
Filed: Feb 12, 1986
Inventors
Masahiro Kouno
Kazumi Mizutani
Masanori Osawa
Kohei Shizuka
Toshihiro Toyoda
Hiromi Nakano
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.