Granted Patent
Utility
US 4,518,745 · App. 06/554,950
Metal chelates of water soluble copolymers
Inventors:
Friedrich Engelhardt, Ulrich Greiner
Patented Case
View Patent ↗
Granted: May 21, 1985
Filed: Nov 25, 1983
Inventors
Friedrich Engelhardt
Ulrich Greiner
Assignee (at issue)
Cassella Aktiengesellschaft
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.