Patent US2843694A successfully refreshed from Google Patents.
US3228741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corneal contact lens fabricated from transparent silicone rubber
Assignee: MUELLER WELT CONTACT LENSES Inc
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Filing: 1962-06-29
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Granted: 1966-01-11
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Expires: 1982-06-29
Abstract
No abstract record available.
Inventors
- 👤 Walter E Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:58
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; Y; Y10; Y10S; Y10S128/00; Y10S128/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
AN IMPROVED CORNEAL CONTACT LENS OF CONCAVO-CONVEX SHAPE ADAPTED TO FLOAT ON AND ADHERE TO THE CORNEA, SAID LENS HAVING A CONCAVE SURFACE CURVATURE SUBSTANTIALLY CONFORMING TO THE CORNEA, SAID LENS BEING FABRICATED FROM TRANSPARENT SILICON RUBBER HAVING A SOFTNESS APPROXIMATING THAT OF THE HUMAN CORNEA, SAID CONTACT LENS BEING BENDABLE UPON ITSELF AND CAPABLE OF RETURNING TO ITS ORIGINAL SHAPE UPON RELEASE OF DISTORTING FORCES AND BEING SUBSTANTIALLY UNBREAKABLE, SAID SILICONE RUBBER HAVING A GAS PERMEABILITY FOR OXYGEN AND CARBON DIOXIDE OF AT LEAST ABOUT 10,000 CC. PER 24-HOUR PERIOD PER 100 SQUARE INCH AREA PER 1 MIL THICKNESS AT A PRESSURE DIFFERENTIAL OF ONE ATMOSPHERE, THEREBY PROVIDING A CONTACT LENS WHICH IS SUBSTANTIALLY NON-ABSORPTIVE OF TEAR FLUIDS IN LIQUID FORM AND WHOSE GAS PERMEABILITY IS SUFFICIENTLY TO SUBSTANTIALLY INCREASE ITS NORMAL SAFE WEARING TIME.
Claim 2
Dependent Claim
136 words
AN IMPROVED CORNEAL CONTACT LENS OF CONCAVO-CONVEX SHAPE ADAPTED TO FLOAT ON AND ADHERE TO THE CORNEA, SAID LENS HAVING A CONCAVE SURFACE CURVATURE SUBSTANTIALLY CONFORMING TO THE CORNEA, SAID LENS BEING FABRICATED FROM TRANSPARENT SILICON RUBBER HAVING A SOFTNESS APPROXIMATING THAT OF THE HUMAN CORNEA, SAID CONTACT LENS BEING BENDABLE UPON ITSELF AND CAPABLE OF RETURNING TO ITS ORIGINAL SHAPE UPON RELEASE OF DISTORTING FORCES AND BEING SUBSTANTIALLY UNBREAKABLE, SAID SILICONE RUBBER HAVING A GAS PERMEABILITY FOR OXYGEN AND CARBON DIOXIDE OF AT LEAST ABOUT 10,000 CC. PER 24-HOUR PERIOD PER 100 SQUARE INCH AREA PER 1 MIL THICKNESS AT A PRESSURE DIFFERENTIAL OF ONE ATMOSPHERE, THEREBY PROVIDING A CONTACT LENS WHICH IS SUBSTANTIALLY NON-ABSORPTIVE OF TEAR FLUIDS IN LIQUID FORM AND WHOSE GAS PERMEABILITY IS SUFFICIENTLY TO SUBSTANTIALLY INCREASE ITS NORMAL SAFE WEARING TIME.
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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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |