US4666267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perforated soft contact lens and a method for manufacturing thereof
Assignee: Czech Academy of Sciences
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Filing: 1984-12-21
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Granted: 1987-05-19
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Expires: 2004-12-21
Abstract
Abstract A perforated soft contact lens which has at least one perforation formed inside the optical zone of lens, i.e. in the distance 0 to 3.5 mm from the lens center. It is manufactured by placing the lens in a swollen state with its inner surface on an elastic base and pressing a punch perpendicularly to the outer surface. Further possible method of manufacturing consists in sticking the soft hydrophilic lens on a hard base, drying and then drilling the openings, advantageously to the first contact of a drill with the base.
Inventors
- 👤 Otto Wichterle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:39
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/049; G02C2202/00; G02C2202/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
In a soft contact lens the improvement which comprises at least one perforation through the lens within the optical zone thereof, located substantially in the center of the lens, the perforation being of circular cross-section having a diameter of 0.2 to 1.5 mm and being larger in cross-section at the outer convex surface and narrowing to a smaller cross-section at the inner concave surface of the lens and wherein the perforation inner walls are coated with a dark, light-scattering material.
Claim 2
Dependent Claim
80 words
In a soft contact lens the improvement which comprises at least one perforation through the lens within the optical zone thereof, located substantially in the center of the lens, the perforation being of circular cross-section having a diameter of 0.2 to 1.5 mm and being larger in cross-section at the outer convex surface and narrowing to a smaller cross-section at the inner concave surface of the lens and wherein the perforation inner walls are coated with a dark, light-scattering material.
Claim 3
Dependent Claim
18 words
The perforated soft contact lens of claim 1 wherein the coating material is a fast dark colored dye.
Claim 4
Dependent Claim
26 words
The perforated soft contact lens of claim 1 wherein the lens is a hydrophilic material and the perforation is coated with silver sulfide or elemental silver.
Claim 5
Dependent Claim
25 words
The perforated soft contact lens of claim 1 wherein the lens is a hydrophillic material and the perforation is coated with black elemental bismuth pigment.
Claim 6
Independent Claim
76 words
The method of making a perforated soft contact lens which comprises the steps of making a contact lens of desired size and shape, perforating said lens in the optical zone at a distance from 0 to 3.5 mm from the center of said lens and coating the surface of said perforation with a dark, light-scattering material which is compatible with the eye and selected from the group consisting of metal salts, pigments and fast, dark dyes.
Claim 7
Independent Claim
76 words
The method of making a perforated soft contact lens which comprises the steps of making a contact lens of desired size and shape, perforating said lens in the optical zone at a distance from 0 to 3.5 mm from the center of said lens and coating the surface of said perforation with a dark, light-scattering material which is compatible with the eye and selected from the group consisting of metal salts, pigments and fast, dark dyes.
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) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |