| http://www.w3.org/ns/prov#value | - Patent US4318791 - Use of aromatic-aliphatic ketones as photo sensitizers - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsAromatic-aliphatic ketones of the formulae I, II, III or IV ##STR1## wherein n is 1 or 2, Ar is an aryl radical, R1 and R2 are monovalent aliphatic, cycloaliphatic or araliphatic radicals, R3 is a direct bond or a diva
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