Granted Patent
Utility
US 4,138,475 · App. 05/833,339
Sustained release pharmaceutical composition
Inventors:
James McAinsh, Raymond C. Rowe
Patented Case
View Patent ↗
Granted: Feb 6, 1979
Filed: Sep 14, 1977
Inventors
James McAinsh
Raymond C. Rowe
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.