Granted Patent
Utility
US 4,395,531 · App. 06/351,602
Process for the preparation of polyamide compounds by the reaction of polycarboxylic acids with diisocyanates in the presence of at least one mono-alkali metal salt of dicarboxylic acid
Inventors:
Toshihiro Toyoda, Motoo Kawamata, Masanori Osawa, Masayoshi Itoh, Kazumi Mizutani, Masahiro Kono
Patented Case
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Granted: Jul 26, 1983
Filed: Feb 23, 1982
Inventors
Toshihiro Toyoda
Motoo Kawamata
Masanori Osawa
Masayoshi Itoh
Kazumi Mizutani
Masahiro Kono
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.