Granted Patent
Utility
US 4,569,994 · App. 06/749,321
Dibenzo[b,d]pyranyloxyaminopropanols
Inventor:
Ronald C. Griffith
Patented Case
View Patent ↗
Granted: Feb 11, 1986
Filed: Jun 27, 1985
Inventor
Ronald C. Griffith
Assignee (at issue)
Pennwalt Corporation
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.