Granted Patent
Utility
US 4,673,565 · App. 06/730,064
Pharmaceutical compositions containing hollow fine tubular drug delivery systems
Inventors:
Robert C. Di Luccio, Ray B. Duggins, Eli Shefter
Patented Case
View Patent ↗
Granted: Jun 16, 1987
Filed: May 3, 1985
Inventors
Robert C. Di Luccio
Ray B. Duggins
Eli Shefter
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.