US4602074A
Expired / Lapsed
US
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Contact lens material
Assignee: Menicon Co Ltd
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Filing: 1984-12-18
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Granted: 1986-07-22
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Expires: 2004-12-18
Abstract
Abstract A contact lens material made of an organosiloxane ester copolymer. The organosiloxane is represented by the general formula: ##STR1## and the ester is composed of C 1 -C 10 mono- or multi-valent alcohol and methacrylic acid, acrylic acid or itaconic acid. The contact lens is oxygen permeable and substantially free of water-absorption, so that it is easy to handle. It may be worn comfortably for extended period.
Inventors
- 👤 Yutaka Mizutani
- 👤 Tatsuo Harata
- 👤 Naokatsu Tanahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:36
CPC Classifications
C; C08; C08F; C08F230/00; C08F230/04; C08F230/08; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
An oxygen-permeable hard contact lens material which is a copolymer formed by the reaction of: (a) an organosiloxane represented by one of the formulae: ##STR6## wherein R 1 is selected from the group consisting of C 1 -C 6 alkyl groups and phenyl groups; R 2 and R 2 ' are selected from the group consisting of C 1 -C 6 alkyl groups and phenyl groups; R 3 and R 4 are selected from the group consisting of C 1 -C 6 alkyl groups, Phenyl groups and ##STR7## R 5 is CH 3 or H; m is 0 or 1; and n is an integer from 1 to 3; and (b) an ester of C 1 -C 10 monohydroxy or polyhydroxy alcohol and an acid selected from the group consisting of methacrylic acid, acrylic acid and itaconic acid.
Claim 2
Dependent Claim
138 words
An oxygen-permeable hard contact lens material which is a copolymer formed by the reaction of: (a) an organosiloxane represented by one of the formulae: ##STR6## wherein R 1 is selected from the group consisting of C 1 -C 6 alkyl groups and phenyl groups; R 2 and R 2 ' are selected from the group consisting of C 1 -C 6 alkyl groups and phenyl groups; R 3 and R 4 are selected from the group consisting of C 1 -C 6 alkyl groups, Phenyl groups and ##STR7## R 5 is CH 3 or H; m is 0 or 1; and n is an integer from 1 to 3; and (b) an ester of C 1 -C 10 monohydroxy or polyhydroxy alcohol and an acid selected from the group consisting of methacrylic acid, acrylic acid and itaconic acid.
Claim 3
Dependent Claim
24 words
A contact lens material according to claim 1, wherein said organosiloxane is 5-80 parts by weight and said ester is 10-95 parts by weight.
Claim 4
Dependent Claim
41 words
A contact lens material according to claim 2, wherein said copolymer further includes ester of linear or branched fluoroalkyl or fluoroalkylbenzyl alcohol having 1-20 fluorine atoms and acid selected from the group consisting of methacrylic acid, acrylic acid and itaconic acid.
Claim 5
Dependent Claim
37 words
The oxygen-permeable hard contact lens material according to claim 2, wherein said copolymer further includes at least one hydrophilic monomer selected from the group consisting of methacrylic acid, acrylic acid, acrylamide, methacrylamide, N-methylol methacrylamide and N-vinyl pyrrolidone.
Claim 6
Dependent Claim
26 words
A contact lens material according to claim 4, wherein said hydrophilic monomer is about 5-10 parts by weight per 5-80 parts by weight of said organosiloxane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |