Granted Patent
Utility
US 4,871,732 · App. 07/247,797
Substituted imidazo(2,1-b)quinazolin-5(3H)-ones and related tricyclic compounds and use as bronchodilators
Inventors:
Norton P. Peet, Shyam Sunder
Patented Case
View Patent ↗
Granted: Oct 3, 1989
Filed: Sep 22, 1988
Inventors
Norton P. Peet
Shyam Sunder
Assignee (at issue)
Merrell Dow Pharmaceuticals Inc.
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.