Compositions – Light transmission modifying compositions – Ultraviolet
Patent
1988-11-25
1990-08-07
Higel, Floyd D.
Compositions
Light transmission modifying compositions
Ultraviolet
252582, 252583, 252585, 350316, 372 22, 372 92, 372 98, 430945, 430940, 360 9624, 360316, G02B 104, G02B 108, G02B 600
Patent
active
049466291
ABSTRACT:
(i) A compound of the formula: ##STR1## wherein R is H, a metal or a group containing a tetravalent N atom;
REFERENCES:
patent: 3351580 (1967-11-01), Koiue et al.
patent: 4619893 (1986-10-01), Takagi et al.
Allen Simon
Gordon Paul F.
Hann Richard A.
Higel Floyd D.
Imperial Chemical Industries PLC
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