US4519681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soft lenticular contact lens with negative refraction
Assignee: Czech Academy of Sciences
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Filing: 1982-01-28
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Granted: 1985-05-28
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Expires: 2002-01-28
Abstract
Abstract A soft lenticular contact lens having negative refraction is provided having an outer convex surface comprising a central curved optical zone and a circumferential curved ring linked together by a conic surface, the conic surface passing tangentially into the circumferential curved ring.
Inventors
- 👤 Otto Wichterle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:50
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
48 words
A soft lenticular contact lens with negative refraction, wherein the outer convex surface comprises a central curved surface (A) and a circumferential curved ring (B), said central surface and said curved ring being linked together by a conic surface (C), tangentially passing into the circumferential curved ring (B).
Claim 2
Dependent Claim
48 words
A soft lenticular contact lens with negative refraction, wherein the outer convex surface comprises a central curved surface (A) and a circumferential curved ring (B), said central surface and said curved ring being linked together by a conic surface (C), tangentially passing into the circumferential curved ring (B).
Claim 3
Dependent Claim
19 words
The soft lenticular contact lens according to claim 1, wherein the central curved surface (A) is a spherical surface.
Claim 4
Dependent Claim
60 words
The soft lenticular contact lens according to claim 1, wherein the circumferential curved ring (B) has, a substantially uniform thickness within ±20%, said thickness being larger than 0.05 mm and smaller than 0.3 mm and the curvature of said circumferential curved ring being constant for the given type of lenses independently of the refraction of the central curved surface (A).
Claim 5
Dependent Claim
26 words
The soft lenticular contact lens according to claim 1, wherein the edge between the central curved surface (A) and the conic surface (C) is rounded off.
Claim 6
Dependent Claim
18 words
The soft lenticular contact lens according to claim 1, wherein the circumferential ring (B) is a spherical surface.
Claim 7
Dependent Claim
23 words
The soft lenticular contact lens according to claim 1, wherein the central curved surface (A) and the circumferential ring (B) are spherical surfaces.
Claim 8
Dependent Claim
81 words
A soft lenticular contact lens having a negative refraction comprising a body having an inner concave spherical surface and an outer convex surface, said outer convex surface having a circular central optical zone, a ring section about its peripheral edge and an annular conical section interconnecting said central zone and said peripheral ring section, the outer surfaces of said optical zone and said annular peripheral ring section being convexly curved, and said conical section passes tangentially into said peripheral ring section.
Claim 9
Dependent Claim
81 words
A soft lenticular contact lens having a negative refraction comprising a body having an inner concave spherical surface and an outer convex surface, said outer convex surface having a circular central optical zone, a ring section about its peripheral edge and an annular conical section interconnecting said central zone and said peripheral ring section, the outer surfaces of said optical zone and said annular peripheral ring section being convexly curved, and said conical section passes tangentially into said peripheral ring section.
References Cited (Backward Citations)
US256369A
Cited
US4239353A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |