US4594401A
Expired / Lapsed
US
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Oxygen permeable hard contact lens formed from styrene monomer containing a silyl or siloxane group
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1984-12-27
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Granted: 1986-06-10
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Expires: 2004-12-27
Abstract
Abstract An oxygen permeable hard contact lens having an improved oxygen permeability and an improved hardness and rigidity and an improved refractive index, made of a polymer comprising a styrene containing a silyl or siloxanyl group having at most 15 silicon atoms.
Inventors
- 👤 Kozo Takahashi
- 👤 Yasuharu Tahaka
- 👤 Kenichi Isobe
- 👤 Shoji Ichinohe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:24
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
72 words
An oxygen permeable hard contact lens made of a polymer formed from not less than about 20 parts by weight of at least one monomer, based on 100 parts by weight of the whole polymer, said at least one monomer comprising a styrene monomer containing a silyl or siloxanyl group and having the formula (I): ##STR6## wherein l is 0 or 1, and n and m are integers of 1 to 15.
Claim 2
Dependent Claim
72 words
An oxygen permeable hard contact lens made of a polymer formed from not less than about 20 parts by weight of at least one monomer, based on 100 parts by weight of the whole polymer, said at least one monomer comprising a styrene monomer containing a silyl or siloxanyl group and having the formula (I): ##STR6## wherein l is 0 or 1, and n and m are integers of 1 to 15.
Claim 3
Dependent Claim
29 words
The contact lens of claim 1, wherein said polymer is a polymer formed from said styrene monomer containing a silyl or siloxanyl group having at most 15 silicon atoms.
Claim 4
Dependent Claim
38 words
The contact lens of claim 1, wherein said polymer is a copolymer formed from (a) said styrene monomer containing a silyl or siloxanyl group having at most 15 silicon atoms and (b) hydrophobic monomer and/or hydrophilic monomer. ##STR7##
Claim 5
Dependent Claim
18 words
The contact lens of claim 1, wherein l is 0, n is an integer of 1 to 15.
Claim 6
Dependent Claim
24 words
The contact lens of claim 1, wherein said styrene monomer having the silyl or siloxanyl group is a compound of the formula (II): ##STR8##
Claim 7
Dependent Claim
24 words
The contact lens of claim 1, wherein said styrene monomer having the silyl or siloxanyl group is a compound of the formula (III): ##STR9##
Claim 8
Dependent Claim
24 words
The contact lens of claim 1, wherein said styrene monomer having the silyl or siloxanyl group is a compound of the formula (IV): ##STR10##
Claim 9
Dependent Claim
17 words
The contact lens of claim 1, wherein said siloxanyl group is a branched or linear siloxanyl group.
Claim 10
Dependent Claim
14 words
The contact lens of claim 1, wherein said siloxanyl group is a cyclic structure.
Claim 11
Dependent Claim
50 words
The contact lens of claim 3, wherein component (b) of said copolymer contains at least one of 0 to about 80 parts by weight of said hydrophobic monomer and 0 to about 20 parts by weight of said hydrophilic monomer, based upon 100 parts by weight of the whole copolymer.
Claim 12
Dependent Claim
53 words
The contact lens of claim 3, wherein said component (b) of said copolymer contains at least one of about 10 to about 80 parts by weight of said hydrophobic monomer and about 5 to about 20 parts by weight of said hydrophilic monomer, based upon 100 parts by weight of the whole copolymer.
Claim 13
Dependent Claim
36 words
The contact lens of claim 11, wherein component (a) of said copolymer is present in an amount from about 20 to about 97 parts by weight, based upon 100 parts by weight of the whole copolymer.
Claim 14
Dependent Claim
8 words
The contact lens of claim 1, wherein l=1.
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) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |