Patent US4576453A successfully refreshed from Google Patents.
US4576453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-occluding contact lens
Assignee: Individual
•
Filing: 1984-08-03
•
Granted: 1986-03-18
•
Expires: 2004-08-03
Abstract
Abstract A contact lens is featured for use by light sensitive wearers. The lens comprises a centrally shaded portion whose shade is optically graded from a relatively darker center to a relatively light or transparent periphery. The diameter of the shade is greater than a fully contracted pupil, as when the eye is exposed to bright sunlight, but less than a fully dilated pupil, as when the eye is exposed to very dim light.
Inventors
- 👤 Richard Borowsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:47
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/021; G02C7/10; G02C7/105; G02C7/16
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
84 words
A light-occluding contact lens having a shaded portion that has a progressive graded optical density whose gradation extends across the lens from a relatively darker center portion to a relatively lighter peripheral portion, and said gradation extending across the lens to a diameter between that of a dilated and contracted pupil of said lens wearer, said gradation adapted to vary optical density substantially imperceptibly to the wearer of said lens, whereby said lens is a benefit to lens wearers having a sensitivity to light.
Claim 2
Dependent Claim
84 words
A light-occluding contact lens having a shaded portion that has a progressive graded optical density whose gradation extends across the lens from a relatively darker center portion to a relatively lighter peripheral portion, and said gradation extending across the lens to a diameter between that of a dilated and contracted pupil of said lens wearer, said gradation adapted to vary optical density substantially imperceptibly to the wearer of said lens, whereby said lens is a benefit to lens wearers having a sensitivity to light.
Claim 3
Dependent Claim
12 words
The light-occluding lens of claim 1, wherein said gradation is substantially linear.
Claim 4
Dependent Claim
13 words
The light-occluding contact lens of claim 1, wherein said gradation is substantially exponential.
Claim 5
Dependent Claim
20 words
The light-occluding contact lens of claim 1, wherein said gradation varies gradually from said center portion to said peripheral portion.
Claim 6
Dependent Claim
14 words
The light-occluding contact lens of claim 1, wherein said gradation follows a formulated variation.
Claim 7
Dependent Claim
29 words
A light-occluding contact lens of claim 1, wherein said lens has an effective light transmittance of approximately 80 percent in dim light and approximately 10 percent in bright light.
Claim 8
Dependent Claim
29 words
The light-occluding contact lens of claim 1, wherein said gradation extends across the lens to a diameter between that of a dilated and contracted pupil of said lens wearer.
Claim 9
Dependent Claim
72 words
An optically graded contact lens having a progressively graded optical density in the central portion and having a light transmittance of approximately at least 80 percent in dim light and only approximately 10 percent in bright light, said dim light being defined as light of an approximated intensity of 4 to 125 foot candles, and said bright light being defined as light of an approximate intensity of 5000 to 10,000 foot candles.
Claim 10
Dependent Claim
72 words
An optically graded contact lens having a progressively graded optical density in the central portion and having a light transmittance of approximately at least 80 percent in dim light and only approximately 10 percent in bright light, said dim light being defined as light of an approximated intensity of 4 to 125 foot candles, and said bright light being defined as light of an approximate intensity of 5000 to 10,000 foot candles.
Claim 11
Dependent Claim
30 words
The optically graded contact lens of claim 8, wherein said lens is optically graded between a central optical density of approximately 1.4 and a peripheral optical density of approximately zero.
Claim 12
Dependent Claim
27 words
The optically graded contact lens of claim 8, having a diameter of gradation lying between the diameter of a dilated and contracted pupil of a lens wearer.
Claim 13
Dependent Claim
21 words
The optically graded contact lens of claim 9, wherein said lens is graded substantially linearly between central and peripheral optical densities.
Claim 14
Dependent Claim
21 words
The optically graded contact lens of claim 9, wherein said lens is graded substantially exponentially between central and peripheral optical densities.
Claim 15
Dependent Claim
19 words
The optically graded contact lens of claim 9, wherein said lens is graded in accordance with a formulated variation.
Claim 16
Dependent Claim
60 words
An optically graded contact lens having progressively graded optical density in the central portion and having a light transmittance of at least approximately 80 percent in dim light wherein said pupil has dilated to approximately between 6 and 8 mm in diameter and only 10 percent in bright light wherein said pupil has contracted to approximately 2 mm in diameter.
Claim 17
Dependent Claim
60 words
An optically graded contact lens having progressively graded optical density in the central portion and having a light transmittance of at least approximately 80 percent in dim light wherein said pupil has dilated to approximately between 6 and 8 mm in diameter and only 10 percent in bright light wherein said pupil has contracted to approximately 2 mm in diameter.
Claim 18
Dependent Claim
22 words
The optically graded contact lens of claim 14, wherein an optically graded portion of said lens is approximately 4.5 mm in diameter.
Claim 19
Dependent Claim
23 words
The optically graded contact lens of claim 14, wherein an optical density of a central section of said graded portion is approximately 1.4
References Cited (Backward Citations)
US3034403A
Cited
US4121885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |