Granted Patent
Utility
US 4,353,887 · App. 06/177,028
Divisible tablet having controlled and delayed release of the active substance
Inventors:
Hans Karl Hess, Carlo Voellmy
Patented Case
View Patent ↗
Granted: Oct 12, 1982
Filed: Aug 11, 1980
Inventors
Hans Karl Hess
Carlo Voellmy
Assignee (at issue)
Ciba-Geigy
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.