Patent US5089023A successfully refreshed from Google Patents.
US5089023A
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Diffractive/refractive lens implant
Assignee: Massachusetts Institute of Technology
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Filing: 1990-03-22
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Granted: 1992-02-18
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Expires: 2010-03-22
Abstract
Abstract In an intraocular optical implant including a refractive/diffractive lens having an anterior surface and a posterior surface and a generally anterior-posterior optical axis, at least one of the surfaces has a diffractive lens profile covering about half the effective lens area of the lens. Preferably the diffractive lens profile occupies a sectoral portion of the effective lens area, as for example a semicircular sectoral portion, or a plurality of sectoral portions the sum of whose subtended angles is about 180°, as for example two sectoral portions each of whose subtended angles is about 90°.
Inventors
- 👤 Gary J. Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:15
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/18; G02B5/1876; A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/16; A61F2/1613; A61F2/1616; A61F2/1618; A61F2/1654; G02B5/188; G02B5/189; G02B5/1895
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
46 words
An intraocular optical implant comprising a refractive/diffractive lens having an anterior surface and a posterior surface and a generally anterior-posterior optical axis, at least one of said anterior and posterior surfaces having a diffractive lens profile covering about half the effective lens area of said lens.
Claim 2
Dependent Claim
46 words
An intraocular optical implant comprising a refractive/diffractive lens having an anterior surface and a posterior surface and a generally anterior-posterior optical axis, at least one of said anterior and posterior surfaces having a diffractive lens profile covering about half the effective lens area of said lens.
Claim 3
Dependent Claim
17 words
The implant of claim 1 wherein said diffractive lens profile comprises a Fresnel phase zone plate profile.
Claim 4
Dependent Claim
16 words
The implant of claim 2 wherein said diffractive lens profile comprises a blazed diffraction lens profile.
Claim 5
Dependent Claim
16 words
The implant of claim 2 wherein said diffractive lens profile comprises a stepped diffractive lens profile.
Claim 6
Dependent Claim
25 words
The implant of claim 3 or 4 wherein said diffraction zone profile has a thickness D given by ##EQU8## where λ.sub.° is about 550 nm.
Claim 7
Dependent Claim
21 words
The implant of claim 1 wherein said diffractive lens profile comprises at least one sectoral portion of said effective lens area.
Claim 8
Dependent Claim
20 words
The implant of claim 6 wherein said diffractive lens profile comprises a semicircular sectoral portion of said effective lens area.
Claim 9
Dependent Claim
30 words
The implant of claim 6 wherein said diffractive lens profile comprises a plurality of sectoral portions of said effective lens area, the sum of whose subtended angles is about 180°.
Claim 10
Dependent Claim
27 words
The implant of claim 8 wherein said diffractive lens profile comprises two sectoral portions of said effective lens area, each of whose subtended angles is about 90°.
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) | 1995-02-17 | 1995-08-19 | 1996-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-17 | 1999-08-19 | 2000-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-17 | 2003-08-19 | 2004-02-18 | $7700.00 | Window Closed / Lapsed |