Granted Patent
Utility
US 4,290,771 · App. 06/074,748
Diagnostic agent for the detection of urobilinogen
Inventor:
Wolfgang Hirsch
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Sep 12, 1979
Inventor
Wolfgang Hirsch
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.