Granted Patent
Utility
US 5,138,072 · App. 07/800,702
Process for the preparation of 5-chloro-3-chlorosulphonyl-2-thiophenecarboxylic acid esters
Inventor:
Hans Wagner
Patented Case
View Patent ↗
Granted: Aug 11, 1992
Filed: Dec 2, 1991
Inventor
Hans Wagner
Assignee (at issue)
Hafslund Nycomed Pharma 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.