US5116111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-focal diffractive ophthalmic lenses
Assignee: 3M Co
•
Filing: 1991-02-11
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Granted: 1992-05-26
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Expires: 2011-02-11
Abstract
Abstract A multifocal ophthalmic lens has diffractive power produced by a plurality of concentric zones. The zones have radii that meet the condition R.sub.0.sup.2 is not equal to R.sub.1.sup.2 -R.sub.0.sup.2 where R 0 is the radius of the central zone and R 1 is the radius of the first annular zone.
Inventors
- 👤 Michael J. Simpson
- 👤 John A. Futhey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:25
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/18; G02B5/1876; G02B5/189; G02B5/1895; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/042; G02C7/044; G02C7/06; G02C2202/00; G02C2202/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
73 words
A multifocal ophthalmic lens having optical power, at least a portion of said optical power being produced by diffraction, said lens having a plurality of diffractive zones including a central zone and a plurality of concentric annular zones, said central zone having a radius r 0 and the innermost of said annular zones having a radius r 1 where r 0 2 is not equal to r 1 2 -r 0 2 .
Claim 2
Dependent Claim
73 words
A multifocal ophthalmic lens having optical power, at least a portion of said optical power being produced by diffraction, said lens having a plurality of diffractive zones including a central zone and a plurality of concentric annular zones, said central zone having a radius r 0 and the innermost of said annular zones having a radius r 1 where r 0 2 is not equal to r 1 2 -r 0 2 .
Claim 3
Dependent Claim
13 words
The ophthalmic lens of claim 1 wherein said lens is an intraocular lens.
Claim 4
Dependent Claim
13 words
The ophthalmic lens of claim 1 wherein said lens is a contact lens.
Claim 5
Dependent Claim
13 words
The ophthalmic lens of claim 1 wherein said lens is an artificial cornea.
Claim 6
Dependent Claim
13 words
The ophthalmic lens of claim 1 wherein said lens is an intralamellar implant.
Claim 7
Dependent Claim
20 words
The ophthalmic lens of claim 1 wherein r 0 2 is less than r 1 2 -r 0 2 .
Claim 8
Dependent Claim
20 words
The ophthalmic lens of claim 1 wherein r 0 2 is greater than r 1 2 -r 0 2 .
Claim 9
Dependent Claim
28 words
The ophthalmic lens of claim 1 wherein said zones are separated by optical steps having an optical height of one half wavelength for light of a design wavelength.
Claim 10
Dependent Claim
24 words
The ophthalmic lens of claim 7 wherein said design wavelength is in the spectral region of the greatest photopic sensitivity of the human eye.
Claim 11
Dependent Claim
16 words
The ophthalmic lens of claim 1 wherein said diffractive zones are provided on a curved surface.
Claim 12
Dependent Claim
21 words
The ophthalmic lens of claim 10 wherein said zones have radii that are corrected for the curvature of said curved surface.
Claim 13
Dependent Claim
12 words
The ophthalmic lens of claim 10 wherein said curved surface is concave.
Claim 14
Dependent Claim
21 words
The ophthalmic lens of claim 12 wherein said zones have radii that are corrected for the curvature of said curved surface.
Claim 15
Dependent Claim
27 words
The ophthalmic lens of claim 13 wherein said zones are separated by steps having an optical height of one half wavelength for light of a design wavelength.
Claim 16
Dependent Claim
12 words
The ophthalmic lens of claim 10 wherein said curved surface is convex.
Claim 17
Dependent Claim
21 words
The ophthalmic lens of claim 15 wherein said zones have radii that are corrected for the curvature of said curved surface.
Claim 18
Dependent Claim
27 words
The ophthalmic lens of claim 16 wherein said zones are separated by steps having an optical height of one half wavelength for light of a design wavelength.
References Cited (Backward Citations)
US4340283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |