US4573774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soft toric contact lens
Assignee: Johnson and Johnson Vision Care Inc
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Filing: 1985-02-19
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Granted: 1986-03-04
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Expires: 2005-02-19
Abstract
Abstract A soft toric contact lens having spherocylindrical power for correcting astigmatism in humans and utilizing a prism ballast as a means of maintaining correct axial orientation. The degree of prism is greater than about 0.5 diopter, and the peripheral outer surface of the lens is tapered off to a relatively thin edge of constant thickness over a substantial portion of the ballast area.
Inventors
- 👤 George Sitterle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:28
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/048
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
94 words
A soft toric contact lens of spherocylindrical power having a concave inner surface, a convex outer surface, a horizontal axis and a vertical axis; said outer surface having a central optical zone and a peripheral lenticular zone; said lens including a prism ballast in the vertical axis, the degree of prism being from about 0.5 to 1.0 diopter; the outer surface of said lens having a smoothly beveled tapered-off region in the lenticular zone in the area of maximum ballast, the edge of said lens having a substantially uniform thickness in said tapered-off region.
Claim 2
Dependent Claim
94 words
A soft toric contact lens of spherocylindrical power having a concave inner surface, a convex outer surface, a horizontal axis and a vertical axis; said outer surface having a central optical zone and a peripheral lenticular zone; said lens including a prism ballast in the vertical axis, the degree of prism being from about 0.5 to 1.0 diopter; the outer surface of said lens having a smoothly beveled tapered-off region in the lenticular zone in the area of maximum ballast, the edge of said lens having a substantially uniform thickness in said tapered-off region.
Claim 3
Dependent Claim
14 words
The soft contact lens of claim 1 wherein said tapered off region is crescent-shaped.
Claim 4
Dependent Claim
21 words
The soft contact lens of claim 1 wherein said concave inner surface is spherical and said convex outer surface is toric.
Claim 5
Dependent Claim
31 words
The soft contact lens of claim 1 wherein the orientation of said spherocylindrical power is in the vertical axis, and said tapered-off region is crescent-shaped and symmetrical about said vertical axis.
Claim 6
Dependent Claim
34 words
The soft contact lens of claim 1 wherein the orientation of said spherocylindrical power is at an angle to the vertical axis, and said tapered-off region is crescent-shaped and nonsymmetrical about said vertical axis.
Claim 7
Dependent Claim
16 words
The soft contact lens of claim 1 wherein the degree of prism is about 0.75 diopters.
Claim 8
Dependent Claim
22 words
The soft contact lens of claim 1 wherein said tapered-off region extends radially at least about 50 percent into said lenticular zone.
Claim 9
Dependent Claim
25 words
The soft contact lens of claim 1 wherein said tapered-off region extends radially from about 50 percent to about 75 percent into said lenticular zone.
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) | 1989-03-03 | 1989-09-02 | 1990-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-03 | 1993-09-02 | 1994-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-03 | 1997-09-02 | 1998-03-04 | $7700.00 | Window Closed / Lapsed |