Granted Patent
Utility
US 4,721,734 · App. 06/646,285
Photosensitive hydroxylalkylphenones
Inventors:
Juergen Gehlhaus, Manfred Kieser
Patented Case
View Patent ↗
Granted: Jan 26, 1988
Filed: Aug 31, 1984
Inventors
Juergen Gehlhaus
Manfred Kieser
Assignee (at issue)
Merck Patent GmbH
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.