Granted Patent
Utility
US 5,015,774 · App. 07/436,001
Preparation process of polyoxyalkylene polyamine having terminal secondary amino group
Inventors:
Ariko Suekane, Fumio Yamazaki, Takayoshi Masuda
Patented Case
View Patent ↗
Granted: May 14, 1991
Filed: Nov 14, 1989
Inventors
Ariko Suekane
Fumio Yamazaki
Takayoshi Masuda
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.