Granted Patent
Utility
US 4,422,976 · App. 06/364,894
Continuous preparation of organic isocyanates
Inventors:
Ryuichi Yamamoto, Akinobu Takagi, Masafumi Kataita, Kenji C. Obata, Shigeki Mori
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: Apr 2, 1982
Inventors
Ryuichi Yamamoto
Akinobu Takagi
Masafumi Kataita
Kenji C. Obata
Shigeki Mori
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.