Granted Patent
Utility
US 4,874,894 · App. 07/043,788
Process for the production of benzenesulfonamides
Inventor:
Ramamurthi Kannan
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Apr 29, 1987
Inventor
Ramamurthi Kannan
Assignee (at issue)
Hilton Davis Co.
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.