Granted Patent
Utility
US 4,654,421 · App. 06/874,930
4-substituted phenyl crotyl ether derivative
Inventors:
Yasuyuki Tanaka, Haruyoshi Takatsu, Kiyohumi Takeuchi
Patented Case
View Patent ↗
Granted: Mar 31, 1987
Filed: Jun 16, 1986
Inventors
Yasuyuki Tanaka
Haruyoshi Takatsu
Kiyohumi Takeuchi
Assignee (at issue)
Dainippon Ink and Chemicals, Inc.
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.