Granted Patent
Utility
US 4,547,537 · App. 06/637,240
N-Piperidyl tetrahydro-1,4-oxazin-2-one light stabilizers
Inventors:
Roger F. Malherbe, Michael Ackerman
Patented Case
View Patent ↗
Granted: Oct 15, 1985
Filed: Aug 2, 1984
Inventors
Roger F. Malherbe
Michael Ackerman
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.