Granted Patent
Utility
US 4,921,915 · App. 07/070,543
Dispersion polymers, biologically active dispersion polymers, a process for their preparation, and their use as diagnostic aids
Inventors:
Michael Dengler, Wolfgang Kapmeyer, Helmut Rinno
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Jul 7, 1987
Inventors
Michael Dengler
Wolfgang Kapmeyer
Helmut Rinno
Assignee (at issue)
Behringwerke 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.