US4881804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multifocal phase plate with a pure refractive portion
Assignee: Individual
•
Filing: 1987-11-12
•
Granted: 1989-11-21
•
Expires: 2007-11-12
Abstract
Abstract An ophthalmic contact lens with a phase plate and a pure refractive portion within its optic zone. The invention embraces an ophthalmic contact lens of the Cohen lens design with a phase plate and a pure refractive portion within its optic zone.
Inventors
- 👤 Allen L. Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:03
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: 38
Claim 1
Independent Claim
17 words
An ophthalmic contact lens with a phase plate and a pure refractive portion within its optic zone.
Claim 2
Dependent Claim
17 words
An ophthalmic contact lens with a phase plate and a pure refractive portion within its optic zone.
Claim 3
Dependent Claim
29 words
The ophthalmic contact lens of claim 1 wherein the pure refractive portion effects a phase shift which contributes to a focal power of a phase plate of the lens.
Claim 4
Dependent Claim
29 words
The ophthalmic contact lens of claim 1 wherein the pure refractive portion is designed with a power that coincides with one of the diffractive powers of the phase plate.
Claim 5
Dependent Claim
44 words
The ophthalmic contact lens of claim 3 wherein the pure refractive portion is designed to essentially parallel the base curve of the contact lens, thereby focussing light at the zeroth (0 th ) diffractive focal point of the phase plate of the optic zone.
Claim 6
Dependent Claim
29 words
The ophthalmic contact lens of claim 4 wherein the phase plate is located centrally and the pure refractive portion forms the remaining peripheral annular portion of the optic zone.
Claim 7
Dependent Claim
34 words
The ophthalmic contact lens of claim 5 wherein the pure refractive portion is displaced from the base curve of the lens so as to form one of more pure refractive channels in the lens.
Claim 8
Dependent Claim
43 words
The ophthalmic contact lens of claim 6 wherein said pure refractive channel is designed to parallel the base curve of the contact lens, thereby focussing light at the zeroth (0 th ) diffractive focal point of the phase plate of the optic zone.
Claim 9
Dependent Claim
60 words
The ophthalmic contact lens of claim 7 wherein the phase plate is designed with half-wave eshelettes so as to split light equally between the zeroth (0 th ) and first (1 st ) order diffractive focal points and wherein the pure refractive channel is located peripherally of the phase plate and set at a quarterwave depth below the base curve.
Claim 10
Dependent Claim
25 words
The ophthalmic contact lens of claim 5 wherein a transition zone is placed at the juncture between the pure refractive channel and the phase plate.
Claim 11
Dependent Claim
19 words
The ophthalmic contact lens of claim 9 wherein the transition zone is an annular zone circumscribing the phase plate.
Claim 12
Dependent Claim
29 words
The ophthalmic contact lens of claim 6 wherein the peripheral end of the pure refractive channel is open so as to allow the lens to drape to the eye.
Claim 13
Dependent Claim
25 words
The ophthalmic contact lens of claim 11 wherein a transition zone is placed at the junction between the pure refractive channel and the phase plate.
Claim 14
Dependent Claim
29 words
The ophthalmic contact lens of claim 8 wherein the peripheral end of the pure refractive channel is open so as to allow the lens to drape to the eye.
Claim 15
Dependent Claim
22 words
An ophthalmic contact lens of the Cohen lens design with a phase plate and a pure refractive portion within its optic zone.
Claim 16
Dependent Claim
22 words
An ophthalmic contact lens of the Cohen lens design with a phase plate and a pure refractive portion within its optic zone.
Claim 17
Dependent Claim
19 words
The ophthalmic contact lens of a Cohen lens design of claim 14 wherein said lens is a multifocal lens.
Claim 18
Dependent Claim
34 words
The ophthalmic contact lens of a Cohen lens design of claim 15 wherein the pure refractive portion is designed with a power that coincides with one of the diffractive powers of the phase plate.
Claim 19
Dependent Claim
49 words
The ophthalmic contact lens of a Cohen lens design of claim 16 wherein the pure refractive portion is designed to essentially parallel the base curve of the contact lens, thereby focussing light at the zeroth (0 th ) diffractive focal point of the phase plate of the optic zone.
Claim 20
Dependent Claim
34 words
The ophthalmic contact lens of a Cohen lens design of claim 17 wherein the phase plate is located centrally and the pure refractive portion forms the remaining peripheral annular portion of the optic zone.
Claim 21
Dependent Claim
39 words
The ophthalmic contact lens of a Cohen lens design of claim 18 wherein the pure refractive portion is displaced from the base curve of the lens so as to form one or more pure refractive channels in the lens.
Claim 22
Dependent Claim
48 words
The ophthalmic contact lens of a Cohen lens design of claim 19 wherein said pure refractive channel is designed to parallel the base curve of the contact lens, thereby focussing light at the zeroth (0 th ) diffractive focal point of the phase plate of the optic zone.
Claim 23
Dependent Claim
65 words
The ophthalmic contact lens of a Cohen lens design of claim 20 wherein the phase plate is designed with half-wave eshelettes so as to split light equally between the zeroth (0 th ) and first (1 st ) order diffractive focal points and wherein the pure refractive channel is located peripherally of the phase plate and set at a quarter-wave depth below the base curve.
Claim 24
Dependent Claim
30 words
The ophthalmic contact lens of a Cohen lens design of claim 18 wherein a transition zone is placed at the juncture between the pure refractive channel and the phase plate.
Claim 25
Dependent Claim
24 words
The ophthalmic contact lens of a Cohen lens design of claim 22 wherein the transition zone is an annular zone circumscribing the phase plate.
Claim 26
Dependent Claim
34 words
The ophthalmic contact lens of a Cohen lens design of claim 19 wherein the peripheral end of the pure refractive channel is open so as to allow the lens to drape to the eye.
Claim 27
Dependent Claim
30 words
The ophthalmic contact lens of a Cohen lens design of claim 24 wherein a transition zone is placed at the juncture between the pure refractive channel and the phase plate.
Claim 28
Dependent Claim
34 words
The ophthalmic contact lens of a Cohen lens design of claim 21 wherein the peripheral end of the pure refractive channel is open so as to allow the lens to drape to the eye.
Claim 29
Dependent Claim
35 words
A multifocal lens of the Cohen lens design containing, in an optically receptive area, a phase plate and a pure refractive portion which possesses only a zero-order diffraction that symmetrically retards the light passing therethrough.
Claim 30
Dependent Claim
35 words
A multifocal lens of the Cohen lens design containing, in an optically receptive area, a phase plate and a pure refractive portion which possesses only a zero-order diffraction that symmetrically retards the light passing therethrough.
Claim 31
Dependent Claim
23 words
The multifocal lens of the Cohen lens design of claim 27 wherein the optical receptive area comprises a plurality of annular phase plates.
Claim 32
Dependent Claim
44 words
The multifocal lens of the Cohen lens design of claim 27 wherein the zeroth (0 th ) order diffraction zone diffracts light to constructively interfere with the light waves of the phase plate to form or enhance an image at a desired focal point.
Claim 33
Dependent Claim
28 words
The multifocal lens of the Cohen lens design of claim 27 wherein the zeroth (0 th ) order diffraction zone constitutes one or more channels in the lens.
Claim 34
Dependent Claim
25 words
A multifocal lens containing a phase plate and a pure refractive portion which possesses only a zero-order diffraction that symmetrically retards the light passing therethrough.
Claim 35
Dependent Claim
25 words
A multifocal lens containing a phase plate and a pure refractive portion which possesses only a zero-order diffraction that symmetrically retards the light passing therethrough.
Claim 36
Dependent Claim
23 words
The multifocal lens of claim 31 wherein the phase plate and the pure refractive portion comprise a plurality of annular phase zone plates.
Claim 37
Dependent Claim
39 words
The multifocal lens of claim 31 wherein the zeroth (0 th ) order diffraction zone diffracts light to constructively interfere with the light waves of the phase plate to form or enhance an image at a desired focal point.
Claim 38
Dependent Claim
23 words
The multifocal lens of claim 31 wherein the zeroth (0 th ) order diffraction zone constitutes one or more channels in the lens.
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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) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |