Granted Patent
Utility
US 4,769,369 · App. 06/931,279
Anti-allergy 1(2H)-phthalazinones
Inventors:
Telfer L. Thomas, Lesley A. Radov
Patented Case
View Patent ↗
Granted: Sep 6, 1988
Filed: Nov 14, 1986
Inventors
Telfer L. Thomas
Lesley A. Radov
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.