Granted Patent
Utility
US 4,871,779 · App. 06/812,479
Ion exchange/chelation resins containing dense star polymers having ion exchange or chelate capabilities
Inventors:
George R. Killat, Donald A. Tomalia
Patented Case
View Patent ↗
Granted: Oct 3, 1989
Filed: Dec 23, 1985
Inventors
George R. Killat
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.