US5835187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aspheric multifocal contact lens having concentric front surface
Assignee: Polymer Technology Corp
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Filing: 1996-11-22
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Granted: 1998-11-10
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Expires: 2016-11-22
Abstract
Abstract The present invention relates to a multifocal contact lens having an edge, a front and back side and a series of concentrically arranged zones comprising central zone, a marginal zone and a peripheral zone. Each of the zones on the back side of the lens is defined by a second-order surface of revolution other than spherical. The front side of the lens comprises multiple spherical surfaces for providing increasing power correction from the central zone toward the peripheral zone.
Inventors
- 👤 Richard R. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:12
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/044; G02C7/042
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
96 words
A multifocal contact lens having an edge, a front and back side and a plurality of concentrically arranged zones comprising a central zone, a peripheral zone and a marginal zone between said central zone and said peripheral zone, wherein each of the zones on the back side of the lens is defined by a second-order surface of revolution other than spherical, and wherein the marginal zone of the front side comprises at least two different spherical surfaces for providing multiple focal points and provide increasing plus power correction from the central zone toward the peripheral zone.
Claim 2
Dependent Claim
96 words
A multifocal contact lens having an edge, a front and back side and a plurality of concentrically arranged zones comprising a central zone, a peripheral zone and a marginal zone between said central zone and said peripheral zone, wherein each of the zones on the back side of the lens is defined by a second-order surface of revolution other than spherical, and wherein the marginal zone of the front side comprises at least two different spherical surfaces for providing multiple focal points and provide increasing plus power correction from the central zone toward the peripheral zone.
Claim 3
Dependent Claim
23 words
The lens of claim 1 wherein the central and marginal zones of the front side of the lens consist of only spherical surfaces.
Claim 4
Dependent Claim
31 words
The lens of claim 1 wherein the central and marginal zones of the back side of the lens have an axial edge lift which increases toward the edge of the lens.
Claim 5
Dependent Claim
28 words
The lens of claim 1 wherein the peripheral zone on the back side of the lens has an axial edge lift which decreases toward the edge of lens.
Claim 6
Dependent Claim
24 words
The lens of claim 1 wherein the transition between the central zone and marginal zone on the back side of the lens is tangential.
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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) | 2001-11-09 | 2002-05-11 | 2002-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-09 | 2006-05-11 | 2006-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-09 | 2010-05-11 | 2010-11-10 | $7700.00 | Window Closed / Lapsed |