Granted Patent
Utility
US 5,869,735 · App. 08/729,461
Process for the preparation of alkyl aryl ethers containing carboxyl groups
Inventors:
Stefan Antons, Erich Hammerschmidt, Heinz U. Blank, Helmut Fiege, Heinz-Gerd Hartges
Patented Case
View Patent ↗
Granted: Feb 9, 1999
Filed: Oct 11, 1996
Inventors
Stefan Antons
Erich Hammerschmidt
Heinz U. Blank
Helmut Fiege
Heinz-Gerd Hartges
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.