Granted Patent
Utility
US 4,290,957 · App. 06/102,699
Flavonone precursors for alpha amino acid dihydrochalcones
Inventors:
Grant E. Du Bois, Rebecca A. G. Stephenson, Guy A. Crosby
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Dec 12, 1979
Inventors
Grant E. Du Bois
Rebecca A. G. Stephenson
Guy A. Crosby
Assignee (at issue)
Dynapol
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.