Granted Patent
Utility
US 6,462,218 · App. 09/463,272
Method for preparing 3-cyano-2,4-dihalogeno-5-fluoro-Benzoic acid
Inventors:
Werner Hallenbach, Albrecht Marhold
Patented Case
View Patent ↗
Granted: Oct 8, 2002
Filed: Jan 24, 2000
Inventors
Werner Hallenbach
Albrecht Marhold
Assignee (at issue)
Bayer Aktiengesellschaft
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.