Granted Patent
Utility
US 4,443,471 · App. 06/390,773
Derivatives of M.139,603 useful as growth promoters
Inventors:
David H. Davies, Michael J. Smithers
Patented Case
View Patent ↗
Granted: Apr 17, 1984
Filed: Jun 21, 1982
Inventors
David H. Davies
Michael J. Smithers
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.