US4752123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentric bifocal contact lens with two distance power regions
Assignee: University Optical Products Co
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Filing: 1985-11-19
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Granted: 1988-06-21
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Expires: 2005-11-19
Abstract
Abstract A concentric bifocal contact lens is disclosed. The lens has a first distance power correction region of circular periphery in the central portion thereof, surrounded in succession by a concentric near power correction annular region and a concentric second distance power correction annular region. Under bright conditions, when the pupil of the eye is small, the central distance power region is helpful in achieving good distance vision.
Inventors
- 👤 J. Warren Blaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:01
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/044; G02C7/042
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
66 words
A bifocal contact lens for the cornea of an eye, comprising: a lens body adapted to fit on the corneal surface of the eye; said body consisting of the following three regions: a first distance power correction region of circular periphery in the central portion thereof, surrounded in succession by a concentric near power correction annular region and a concentric second distance power correction annular region.
Claim 2
Dependent Claim
66 words
A bifocal contact lens for the cornea of an eye, comprising: a lens body adapted to fit on the corneal surface of the eye; said body consisting of the following three regions: a first distance power correction region of circular periphery in the central portion thereof, surrounded in succession by a concentric near power correction annular region and a concentric second distance power correction annular region.
Claim 3
Dependent Claim
33 words
The lens as defined by claim 1, wherein the near power annular region has an area which is substantially equal to half the pupil area of the eye under average reading light conditions.
Claim 4
Dependent Claim
26 words
The lens as defined by claim 1, wherein the diameter of said first distance power correction region is in the range 0.5 mm to 1.5 mm.
Claim 5
Dependent Claim
26 words
The lens as defined by claim 2, wherein the diameter of said first distance power correction region is in the range 0.5 mm to 1.5 mm.
Claim 6
Dependent Claim
28 words
The lens as defined by claim 1, wherein said lens body has a symmetrically curved rear surface adapted to fit centrally on the corneal surface of the eye.
Claim 7
Dependent Claim
28 words
The lens as defined by claim 2, wherein said lens body has a symmetrically curved rear surface adapted to fit centrally on the corneal surface of the eye.
Claim 8
Dependent Claim
28 words
The lens as defined by claim 3, wherein said lens body has a symmetrically curved rear surface adapted to fit centrally on the corneal surface of the eye.
Claim 9
Dependent Claim
28 words
The lens as defined by claim 4, wherein said lens body has a symmetrically curved rear surface adapted to fit centrally on the corneal surface of the eye.
Claim 10
Dependent Claim
20 words
The lens as defined by claim 1, wherein said lens body is formed of a single piece of plastic material.
Claim 11
Dependent Claim
20 words
The lens as defined by claim 2, wherein said lens body is formed of a single piece of plastic material.
Claim 12
Dependent Claim
20 words
The lens as defined by claim 3, wherein said lens body is formed of a single piece of plastic material.
Claim 13
Dependent Claim
20 words
The lens as defined by claim 4, wherein said lens body is formed of a single piece of plastic material.
Claim 14
Dependent Claim
20 words
The lens as defined by claim 5, wherein said lens body is formed of a single piece of plastic material.
Claim 15
Dependent Claim
20 words
The lens as defined by claim 6, wherein said lens body is formed of a single piece of plastic material.
Claim 16
Dependent Claim
20 words
The lens as defined by claim 8, wherein said lens body is formed of a single piece of plastic material.
Claim 17
Dependent Claim
14 words
The lens as defined by claim 9, wherein said plastic material is silicone acrylate.
Claim 18
Dependent Claim
14 words
The lens as defined by claim 10, wherein said plastic material is silicone acrylate.
Claim 19
Dependent Claim
15 words
The lens as defined by claim 9, wherein said plastic material is polyhydroxyl ethyl methacrylate.
Claim 20
Dependent Claim
15 words
The lens as defined by claim 10, wherein said plastic material is polyhydroxyl ethyl methacrylate.
Claim 21
Dependent Claim
15 words
The lens as defined by claim 14, wherein said plastic material is polyhydroxyl ethyl methacrylate.
Claim 22
Dependent Claim
56 words
A bifocal lens, comprising a lens body for mounting in conjunction with an eye, said body consisting of the following three regions: a first distance power correction region of circular periphery in the central portion thereof, surrounded in succession by a concentric near power correction annular region and a concentric second distance power correction annular region.
Claim 23
Dependent Claim
56 words
A bifocal lens, comprising a lens body for mounting in conjunction with an eye, said body consisting of the following three regions: a first distance power correction region of circular periphery in the central portion thereof, surrounded in succession by a concentric near power correction annular region and a concentric second distance power correction annular region.
Claim 24
Dependent Claim
33 words
The lens as defined in claim 21, wherein the near power annular region has an area which is substantially equal to half the pupil area of the eye under average reading light conditions.
Claim 25
Dependent Claim
26 words
The lens as defined in claim 21, wherein the diameter of said first distance power correction region is in the range 0.5 mm to 1.5 mm.
Claim 26
Dependent Claim
26 words
The lens as defined in claim 22, wherein the diameter of said first distance power correction region is in the range 0.5 mm to 1.5 mm.
Claim 27
Dependent Claim
20 words
The lens as defined in claim 21, wherein said lens body is formed of a single piece of plastic material.
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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) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |