chapter
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u.s.

Company (1974); Chem. Abstr. 82:114583r (1975). 49. V. Petrovich, U.S. Pat. 3,976,566 (1976). 50. W. S. Mardis and C. M. Finlayson, U.S. Pat. 4,434,076 to

N. L. Industries, Inc. (1984); S. J. Hildebrandt, U. S. Pat. 4,386,010 to Engelhard Corporation (1983).