Patent US2060364A successfully refreshed from Google Patents.
US4114993A
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US
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Finished silicone contact lenses
Assignee: American Optical Corp
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Filing: 1977-01-27
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Granted: 1978-09-19
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Expires: 1997-01-27
Abstract
Abstract A method of finishing silicone lenses which avoids weakening, scratching or tearing the lens is disclosed and a filled silicone lens coated with an unfilled silicone elastomer is also disclosed.
Inventors
- 👤 Edward A. Travnicek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:37
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; C; C09; C09D; C09D183/00; C09D183/04; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
153 words
A silicone contact lens comprising a cured, filled, silicone substrate having machined surfaces and an evenly distributed, unfilled, subsequently cured silicone coating on the substrate, wherein the substrate comprises 80 to 95% by weight of a. a copolymer comprising i. dimethyl siloxane, ii. diphenyl siloxane, or phenylmethyl siloxane or mixtures thereof, and iii. vinyl siloxane; b. a copolymer comprising i. dimethyl siloxane ii. diphenyl siloxane or phenylmethyl siloxane or mixtures thereof, and iii. siloxane having (R) 2 HSiO-- or --O--SiHR--O-- groups, or both, wherein R is methyl or ethyl; with the proviso that each of fractions (a) and (b) has 6 to 16 mole percent phenyl and each contains no Part (iii) of the other; c. 5 to 20% of a silica filler, the refractive index of said copolymer being substantially the same as the index of refraction of (c) and the coating liquid consists of a vulcanized mixture of (a) and (b).
Claim 2
Dependent Claim
153 words
A silicone contact lens comprising a cured, filled, silicone substrate having machined surfaces and an evenly distributed, unfilled, subsequently cured silicone coating on the substrate, wherein the substrate comprises 80 to 95% by weight of a. a copolymer comprising i. dimethyl siloxane, ii. diphenyl siloxane, or phenylmethyl siloxane or mixtures thereof, and iii. vinyl siloxane; b. a copolymer comprising i. dimethyl siloxane ii. diphenyl siloxane or phenylmethyl siloxane or mixtures thereof, and iii. siloxane having (R) 2 HSiO-- or --O--SiHR--O-- groups, or both, wherein R is methyl or ethyl; with the proviso that each of fractions (a) and (b) has 6 to 16 mole percent phenyl and each contains no Part (iii) of the other; c. 5 to 20% of a silica filler, the refractive index of said copolymer being substantially the same as the index of refraction of (c) and the coating liquid consists of a vulcanized mixture of (a) and (b).
Claim 3
Dependent Claim
24 words
The contact lens of claim 1 wherein the substrate is a filled RTV 655 elastomer and the coating is an unfilled RTV 655 elastomer.
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) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |