Patent US5125729A successfully refreshed from Google Patents.
US5125729A
Expired / Lapsed
US
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Multifocal contact lens
Assignee: CooperVision International Ltd
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Filing: 1991-05-03
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Granted: 1992-06-30
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Expires: 2011-05-03
Abstract
Abstract The lens includes on its front face a central spherical circular area surrounded by an annular aspherical area. Optionally the lens may include a second spherical annular area surrounding the first annular area. Another annular area which may be separated from the second annular area by a transition annular area, may complete the front face of the lens. The rear face may include a central circular spherical area which may be surrounded by a tangential annular area. A toric area may be centrally disposed on the rear face central area.
Inventors
- 👤 Robert Mercure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:07
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/044; G02C7/042; G02C7/043
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
Multifocal contact lens comprising on a front face thereof a central circular area having a spherical surface, said central circular area being dimensioned to cover about 50% to 70% of a pupil of an eye, and a ring shaped area surrounding the central area having an aspherical surface having a dioptric power in the form of progressive addition which varies from a zero addition at inner periphery of said ring shaped area to a maximum addition at outer periphery thereof, said aspherical surface enabling vision at all distances including reading.
Claim 2
Dependent Claim
90 words
Multifocal contact lens comprising on a front face thereof a central circular area having a spherical surface, said central circular area being dimensioned to cover about 50% to 70% of a pupil of an eye, and a ring shaped area surrounding the central area having an aspherical surface having a dioptric power in the form of progressive addition which varies from a zero addition at inner periphery of said ring shaped area to a maximum addition at outer periphery thereof, said aspherical surface enabling vision at all distances including reading.
Claim 3
Dependent Claim
25 words
Multifocal contact lens according to claim 1, which includes a second ring shaped area surrounding the first ring shaped area and having a spherical surface.
Claim 4
Dependent Claim
48 words
Multifocal contact lens according to claim 2, which comprises a third ring shaped area having a spherical surface and a fourth ring shaped area completing the front face of the lens, said third ring shaped area constituting a transition area between the second and fourth ring shaped areas.
Claim 5
Dependent Claim
22 words
Multifocal contact lens according to claim 3, which includes a second central circular spherical area on the posterior face of said lens.
Claim 6
Dependent Claim
20 words
Multifocal contact lens according to claim 4, which includes a tangential annular area which surrounds said second central spherical area.
Claim 7
Dependent Claim
21 words
Multifocal contact lens according to claim 5, including a toric area centrally disposed relative to said second central circular spherical area.
References Cited (Backward Citations)
US4971432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-30 | 1995-12-30 | 1996-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-30 | 1999-12-30 | 2000-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-30 | 2003-12-30 | 2004-06-30 | $7700.00 | Window Closed / Lapsed |