16. An understanding of the manner in which controlled
release is accomplished is readily apparent from Figs. 1, 2, 3
and 3a:
17. Fig. 1 "is a cross-section of a tablet-shaped
homogeneous polymer matrix showing the drug components, 1,
homogeneously dispersed in the matrix." Col. 2, lines 66-68.
18. Fig. 2 "is a schematic representation of the same
polymer matrix, 1, after some of the drug has been delivered by
diffusion by entry of liquids into the tortuous microporous
channels, 2, followed by exit of drug solution through the same
tortuous path. This matrix remains essentially intact while
delivering its drug content. Col. 3, lines 1-7).
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