Granted Patent
Utility
US 4,388,472 · App. 06/224,823
Substituted diphenyl ethers
Inventors:
David Cartwright, David J. Collins
Patented Case
View Patent ↗
Granted: Jun 14, 1983
Filed: Jan 13, 1981
Inventors
David Cartwright
David J. Collins
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.