Granted Patent
Utility
US 4,422,971 · App. 06/293,621
Process for the preparation of 6-aminopenicillanic acid-1,1-dioxide
Inventors:
Piet J. Akkerboom, Christophorus Oldenhof
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: Aug 4, 1981
Inventors
Piet J. Akkerboom
Christophorus Oldenhof
Assignee (at issue)
Gist-Brocades N.V.
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.