Granted Patent
Utility
US 4,888,348 · App. 07/091,157
Substituted thioureas, isothioureas and carbodiimides
Inventors:
Josef Ehrenfreund, Manfred Boger, Odd Kristiansen, Jozef Drabek, Haukur Kristinsson
Patented Case
View Patent ↗
Granted: Dec 19, 1989
Filed: Aug 28, 1987
Inventors
Josef Ehrenfreund
Manfred Boger
Odd Kristiansen
Jozef Drabek
Haukur Kristinsson
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.