Granted Patent
Utility
US 5,560,929 · App. 08/152,335
Structured copolymers and their use as absorbents, gels and carriers of metal ions
Inventors:
David M. Hedstrand, Bradley James Helmer, Donald A. Tomalia
Patented Case
View Patent ↗
Granted: Oct 1, 1996
Filed: Nov 12, 1993
Inventors
David M. Hedstrand
Bradley James Helmer
Donald A. Tomalia
Assignee (at issue)
THE DOW CHEMICAL COMPANY
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.