US4304895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultraviolet absorbing corneal contact lenses
Assignee: W-J (DELAWARE) Inc
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Filing: 1976-11-15
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Granted: 1981-12-08
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Expires: 1996-11-15
Abstract
Abstract This invention relates to ultraviolet absorbing lenses, particularly corneal contact lenses, comprising a polymeric shaped body having an ultraviolet absorber dispersed substantially uniformly throughout said body and being in a steady state with respect to extraction thereof from said body by an aqueous medium, and to the method of making such lenses.
Inventors
- 👤 Samuel Loshaek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:12
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/16; A61F2/1613; G; G02; G02B; G02B1/00; G02B5/00; G02B5/20; G02B5/208
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
A corneal contact lens comprising a shaped body comprising a polymer formed by copolymerizing a monomer suitable for use in making such lenses and a copolymerizable monomeric ultraviolet absorber, said absorber being in a steady state with respect to extraction thereof from said body by an aqueous medium and being present in an amount sufficient to absorb radiation in the wavelength range of about 340 to 450 mmu.
Claim 2
Dependent Claim
68 words
A corneal contact lens comprising a shaped body comprising a polymer formed by copolymerizing a monomer suitable for use in making such lenses and a copolymerizable monomeric ultraviolet absorber, said absorber being in a steady state with respect to extraction thereof from said body by an aqueous medium and being present in an amount sufficient to absorb radiation in the wavelength range of about 340 to 450 mmu.
Claim 3
Dependent Claim
21 words
The corneal contact lens of claim 1 wherein the copolymerizable monomeric ultraviolet absorber is selected from: ##STR2## 2-hydroxy-4-methacryloxy-benzophenone or mixtures thereof.
Claim 4
Dependent Claim
67 words
A corneal contact lens comprising a shaped body comprising a polymer formed by copolymerizing a mixture comprising methyl methacrylate, ethyleneglycol dimethacrylate, and a compound of the formula ##STR3## said compound being in a steady state with respect to extraction thereof from said body by an aqueous medium and being present in an amount sufficient to absorb radiation in the wavelength range of about 340 to 450 mmu.
Claim 5
Dependent Claim
67 words
A corneal contact lens comprising a shaped body comprising a polymer formed by copolymerizing a mixture comprising methyl methacrylate, ethyleneglycol dimethacrylate, and a compound of the formula ##STR3## said compound being in a steady state with respect to extraction thereof from said body by an aqueous medium and being present in an amount sufficient to absorb radiation in the wavelength range of about 340 to 450 mmu.
Claim 6
Dependent Claim
39 words
The corneal contact lens of claim 3 further comprising a visible light absorbing dye dispersed substantially uniformly throughout said body in an amount sufficient to absorb not more than about 30% of the visible light passing through the lens.
References Cited (Backward Citations)
US3171869A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |