Granted Patent
Utility
US 4,661,620 · App. 06/780,838
Preparation process of cinnamate esters
Inventors:
Usaji Takaki, Isamu Sudo, Toshio Matsuhisa, Isao Hara
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Sep 27, 1985
Inventors
Usaji Takaki
Isamu Sudo
Toshio Matsuhisa
Isao Hara
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.