US4433125A
Expired / Lapsed
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Oxygen permeable hard contact lens
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1983-01-21
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Granted: 1984-02-21
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Expires: 2003-01-21
Abstract
Abstract An oxygen permeable hard contact lens having an improved oxygen permeability and an improved fragility as well as excellent hardness and rigidity, made of a copolymer comprising an organosilane or organosiloxane having in one molecule at least one group of the general formula (I): <IMAGE> (I) wherein R1 is hydrogen atom or methyl group, k is 0 or 1, and l is 1 or 3, and having at most 16 silicon atoms, and a fluoroalkyl acrylate or methacrylate of the general formula (II): <IMAGE> (II) wherein R1 is as defined above, m is 0 or 1, n is 0 or an integer of 1 to 3, and Rf is a straight or branched fluoroalkyl group having 2 to 21 fluorine atoms.
Inventors
- 👤 Shoji Ichinohe
- 👤 Kouzou Takahashi
- 👤 Yasuharu Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:13
CPC Classifications
C; C08; C08F; C08F230/00; C08F230/04; C08F230/08; G; G02; G02B; G02B1/00; G02B1/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
An oxygen permeable hard contact lens made of a copolymer comprising (a) an organosilane or organosiloxane compound having in one molecule at least one group of the general formula (I): ##STR17## wherein R 1 is hydrogen atom or methyl group, k is 0 or 1, and l is 1 or 3, and having at most 16 silicon atoms, and (b) a compound of the general formula (II): ##STR18## wherein R 1 is as defined above, m is 0 or 1, n is 0 or an integer of 1 to 3, and R f is a straight or branched fluoroalkyl group having 2 to 21 fluorine atoms.
Claim 2
Dependent Claim
106 words
An oxygen permeable hard contact lens made of a copolymer comprising (a) an organosilane or organosiloxane compound having in one molecule at least one group of the general formula (I): ##STR17## wherein R 1 is hydrogen atom or methyl group, k is 0 or 1, and l is 1 or 3, and having at most 16 silicon atoms, and (b) a compound of the general formula (II): ##STR18## wherein R 1 is as defined above, m is 0 or 1, n is 0 or an integer of 1 to 3, and R f is a straight or branched fluoroalkyl group having 2 to 21 fluorine atoms.
Claim 3
Dependent Claim
67 words
The contact lens of claim 1, wherein the organosiloxane is a compound of the general formula (III): ##STR19## wherein R 1 is hydrogen atom or methyl group, k is 0 or 1, l is 1 or 3, X 1 , Y 1 and Z 1 are the same or different and each is --CH 3 or --O--Si(CH 3 ) 3 , and α is 2 or 3.
Claim 4
Dependent Claim
64 words
The contact lens of claim 1, wherein the organosilane or organosiloxane is a compound of the general formula (IV): ##STR20## wherein R 1 is hydrogen atom or methyl group, k is 0 or 1, l is 1 or 3, R 2 , R 3 and R 4 are an alkyl group having 1 to 3 carbon atoms, 0<a<4, and 0≦b, c, d<4, provided 0<a+b+c+d≦4.
Claim 5
Dependent Claim
64 words
The contact lens of claim 3, wherein the compound (IV) is a compound of the general formula (V): ##STR21## wherein R 1 is hydrogen atom or methyl group, k is 0 or 1, l is 1 or 3, and X 2 , Y 2 and Z 2 are the same or different and each is --CH 3 , ##STR22## integer of 2 to 4.
Claim 6
Dependent Claim
47 words
The contact lens of claim 3, wherein the compound (IV) is a compound of the general formula (VI): ##STR23## wherein R 1 is hydrogen atom or methyl group, k is 0 or 1, l is 1 or 3 and γ is an integer of 2 to 4.
Claim 7
Dependent Claim
31 words
The contact lens of claim 1, wherein said R f is a perfluoroalkyl group of the general formula (VII): --C.sub.p F.sub.2p+1 (VII) wherein p is an integer of 1 to 10.
Claim 8
Dependent Claim
32 words
The contact lens of claim 1, wherein said R f is a fluoroalkyl group of the general formula (VIII): --C.sub.p F.sub.2p H (VIII) wherein p is an integer of 1 to 10.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |