Granted Patent
Utility
US 5,208,222 · App. 07/676,626
"4""-and 4'-alkylthio avermectin derivatives"
Inventors:
Peter T. Meinke, Helmut Mrozik
Patented Case
View Patent ↗
Granted: May 4, 1993
Filed: Mar 28, 1991
Inventors
Peter T. Meinke
Helmut Mrozik
Assignee (at issue)
MERCK & CO., 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.