Appeal 2007-1366
Application 90/005,090
1 We affirm.
2 FINDINGS OF FACT
3 Claimed Subject Matter
4 F. 1. Patentee claims a method of making an oxygen permeable contact
5 lens material.
6 F. 2. The method includes the step of copolymerizing certain comonomers
7 in the presence of a free radical or photo initiator.
8 F. 3. These comonomers are
9 (1) 5-90 weight percent of a specific siloxanyl alkyl ester;
10 (2) 3-90% of an ester of acrylic or methacrylic acid;
11 (3) 0.05%-90% of a surface wetting agent and
12 (4) an oxygen permeable multifunctional siloxanyl alkyl ester
13 cross-linking agent.
14
15 F. 4. The specific siloxanyl alkyl ester monomer is 1,1,1
16 tris(methylsiloxy)methacryloxypropylsilane (hereinafter TRIS), a
17 known siloxanyl alkyl ester having a known use in contact lens
18 materials.
19 F. 5. In addition to the copolymerization step, Claim 1 also specifies the
20 process for making TRIS.
21 F. 6. The specified steps for making TRIS include:
22 (1) mixing specified amounts of
23 methacryloxypropyltrimethoxysilane (MAS) and
24 trimethylchlorosilane (TMCS),
25 (2) adding this mixture to a specified amount of water,
26 (3) agitating this second mixture for a specified time,
27 (4) allowing the mixture to separate,
28 (5) removing and filtering the upper most layer and
29 (6) subjecting the removed material to vacuum distillation.
30
31 F. 7. Patentee’s Claim 1 is reproduced below:
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