Granted Patent
Utility
US 5,574,049 · App. 08/470,667
2,2-dialkyl- and 2,2-dialkyl-3,4-dihydro-3-hydroxy-2H-1-benzopyrans
Inventor:
Paul W. Manley
Patented Case
View Patent ↗
Granted: Nov 12, 1996
Filed: Jun 6, 1995
Inventor
Paul W. Manley
Assignee (at issue)
Sandoz AG
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.