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US5129718A
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Multi-focal diffractive ophthalmic lenses
Assignee: 3M Co
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Filing: 1989-11-21
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Granted: 1992-07-14
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Expires: 2009-11-21
Abstract
Abstract An ophthalmic lens exhibiting diffractive power has a plurality of diffractive zones and smooth surfaces. The zones are arranged such that R 0 2 does not equal R 1 2 -R 0 2 where R 0 is the radius of the central zone and R 1 is the radius of the first annular zone.
Inventors
- 👤 John A. Futhey
- 👤 William B. Isaacson
- 👤 Michael J. Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:53
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/06; A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/16; A61F2/1613; A61F2/1616; A61F2/1618; A61F2/1654; G02B; G02B5/00; G02B5/18; G02B5/1876; G02B5/189; G02B5/1895; G02C7/04; G02C7/041; G02C7/042; G02C7/044; G02C2202/00; G02C2202/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
A multifocal opthalmic lens having diffractive power, said lens having first and second major surfaces, said diffractive power being provided by a central diffractive zone and a plurality of concentric annular diffractive zones surrounding said central zone, said central zone having a radius designed R 0 and each of said annular zones having a radius designated R n where n is the number of the annular zone counted outwardly from the center zone with R 1 being the innermost annular zone and R 0 2 is not equal to R 1 2 -R 0 2 and said first and second major surfaces are smooth.
Claim 2
Dependent Claim
104 words
A multifocal opthalmic lens having diffractive power, said lens having first and second major surfaces, said diffractive power being provided by a central diffractive zone and a plurality of concentric annular diffractive zones surrounding said central zone, said central zone having a radius designed R 0 and each of said annular zones having a radius designated R n where n is the number of the annular zone counted outwardly from the center zone with R 1 being the innermost annular zone and R 0 2 is not equal to R 1 2 -R 0 2 and said first and second major surfaces are smooth.
Claim 3
Dependent Claim
19 words
The lens of claim 1 wherein R 0 2 is less than R 1 2 -R 0 2 .
Claim 4
Dependent Claim
29 words
The lens of claim 1 wherein said lens comprises two material shaving differing indices of refraction having an interface therebetween and said diffractive zones are formed at said interface.
Claim 5
Dependent Claim
19 words
The lens of claim 3 wherein R 0 2 is less than R 1 2 -R 0 2 .
Claim 6
Dependent Claim
20 words
The lens of claim 1 wherein said diffractive zones are formed by introducing a dopant into portions of said lens.
Claim 7
Dependent Claim
19 words
The lens of claim 5 wherein R 0 2 is less than R 1 2 -R 0 2 .
Claim 8
Dependent Claim
12 words
The lens of claim 1 wherein said lens is a contact lens.
Claim 9
Dependent Claim
12 words
The lens of claim 1 wherein said lens is an intraocular lens.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-14 | 1996-01-13 | 1996-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-14 | 2000-01-13 | 2000-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-14 | 2004-01-13 | 2004-07-14 | $7700.00 | Window Closed / Lapsed |