Patent US3822089A successfully refreshed from Google Patents.
US3822089A
Expired / Lapsed
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Contact lens blank or replica made from anhydrous, sparingly cross-linked hydrophilic copolymers
Assignee: Czech Academy of Sciences
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Filing: 1971-10-07
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Granted: 1974-07-02
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Expires: 1991-10-07
Abstract
Abstract A substantially anhydrous sparingly cross-linked hydrophilic polymer capable of being swollen when in contact with water is prepared. The polymer is useful in preparing a contact lens.
Inventors
- 👤 O Wichterle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:55
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
18 words
A blank or replica according to claim 1 wherein the copolymer is in the form of a xerogel.
Claim 2
Dependent Claim
79 words
A blank or replica according to claim 1 wherein the copolymer is a copolymer of a major amount of at least one water-soluble polymerizable monoester of acrylic acid or methacrylic acid and an alcohol having an esterifiable hydroxyl group and at least one additional hydroxyl group, and not more than 2% by weight of said copolymer of a cross-linking agent comprising a diester of said acid and said alcohol capable of forming a three-dimensional cross-linked copolymer with said monoester.
Claim 3
Dependent Claim
14 words
An article according to claim 3 which is a replica of a contact lens.
Claim 4
Dependent Claim
22 words
The replica as claimed in claim 4 wherein said alcohol is selected from the group consisting of ethylene glycol and diethylene glycol.
Claim 5
Dependent Claim
17 words
A replica as claimed in claim 4 wherein said monoester is at least predominantly ethylene glycol monomethacrylate.
Claim 6
Dependent Claim
15 words
A replica as claimed in claim 6 wherein said cross-linking agent is ethylene glycol dimethacrylate.
Claim 7
Dependent Claim
23 words
A replica as claimed in claim 4 wherein said cross-linking agent is present in an amount of 0.1 to 2 percent by weight.
Claim 8
Dependent Claim
37 words
A replica according to claim 4 which is in the form of a xerogel, the copolymer contains at least 98 percent by weight of said monoester and 0.1 to 2 percent by weight of said cross-linking agent.
Claim 9
Dependent Claim
21 words
A replica according to claim 9 wherein the monoester is ethylene glycol monomethacrylate and the cross-linking agent is ethylene glycol dimethacrylate.
Claim 10
Dependent Claim
22 words
A replica according to claim 9 wherein the cross-linking agent is present in an amount of 0.1 to 1.9 percent by weight.
Claim 11
Dependent Claim
56 words
A replica as claimed in claim 4 wherein said monoester is at least predominantly ethylene glycol monomethacrylate and said copolymer is admixed with up to 80 percent by weight, based on the weight of the total composition, of a water-miscible, inert non aqueous solvent selected from the group consisting of dimethyl formamide, ethylene glycol and glycerine.
Claim 12
Dependent Claim
17 words
An article according to claim 2 which is a blank having optically curved inner and outer faces.
Claim 13
Dependent Claim
10 words
An article according to claim 2 which is a replica.
Claim 14
Dependent Claim
16 words
An article according to claim 1 wherein the blank has optically cUrved inner and outer faces.
Claim 15
Dependent Claim
10 words
An article according to claim 1 which is a replica.
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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) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |