Granted Patent
Utility
US 4,591,638 · App. 06/377,193
Dextran or crosslinked dextran having quaternary amino groups
Inventors:
Leif Ahrgren, Anthony De Belder
Patented Case
View Patent ↗
Granted: May 27, 1986
Filed: May 11, 1982
Inventors
Leif Ahrgren
Anthony De Belder
Assignee (at issue)
Pharmacia AB
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.