Appeal No. 1999-0676
Application No. 08/465,625
Gibson discloses compounds having the formula:
where the definitions of variables are set forth in col. 2, line 19 to col. 3, line 4. Like
appellants’ compounds, Gibson’s compounds also have “particular utility as anthelmintics,
ectoparasiticides, insecticides and acaricides” (col. 1, lines 49-53). However, Gibson
specifies that the R2 substituent at position 25 must be alpha-branched (col. 2, line 22).
Gibson states that “[a]lpha-branched means that the carbon atom attached to the 25-ring
position is a secondary carbon atom linked to two further carbon atoms” (col. 2, line 52-55).
Appellants’ compounds differ from Gibson’s compounds in that appellants’ R2 substituent
is linked to the 25-ring position via a methylene group (CH2). The following pictorial
illustrates the difference:
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