US5108169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact lens bifocal with switch
Assignee: Individual
•
Filing: 1991-02-22
•
Granted: 1992-04-28
•
Expires: 2011-02-22
Abstract
Abstract A bifocal contact lens which contains two optical powers and a structure which serves as a switch to determine which power is operative as the wearer looks alternatively at objects located at various distances. The lens switch is designed so as to be triggered by the upper lid as it covers and uncovers various portions of the contact lens when the lens wearer is looking alternatively at objects located at various distances.
Inventors
- 👤 Robert B. Mandell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:36
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/048; G02C7/021; G02C7/041; G02C7/042; G02C7/044; G02C7/049; G02C2202/00; G02C2202/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
56 words
A bifocal contact lens, comprising: a body of refractive material including two zones of different power; and a layer of eyelid-heat sensitive material borne by said body; said layer being so distributed as to substantially reduce the passage of light through one of said zones when it receives heat from an overlying portion of an eyelid.
Claim 2
Dependent Claim
56 words
A bifocal contact lens, comprising: a body of refractive material including two zones of different power; and a layer of eyelid-heat sensitive material borne by said body; said layer being so distributed as to substantially reduce the passage of light through one of said zones when it receives heat from an overlying portion of an eyelid.
Claim 3
Dependent Claim
26 words
A bifocal contact lens as claimed in claim 1, further comprising a ring of thermally conductive material underlying said layer and in heat conducting relationship therewith.
Claim 4
Dependent Claim
19 words
A bifocal contact lens as claimed in claim 1 in which said zones are collocated in a concentric relationship.
Claim 5
Dependent Claim
19 words
A bifocal contact lens as claimed in claim 1 in which said zones are collocated in a vertical relationship.
Claim 6
Dependent Claim
19 words
A bifocal contact lens as claimed in claim 1 in which said layer is comprised of liquid crystal material.
Claim 7
Dependent Claim
19 words
A bifocal contact lens as claimed in claim 1 which has distance and near foci produced by diffraction optics.
Claim 8
Dependent Claim
18 words
A bifocal contact lens as claimed in claim 1 which takes the form of a corneal contact lens.
Claim 9
Dependent Claim
18 words
A bifocal contact lens as claimed in claim 1 which takes the form of a scleral contact lens.
Claim 10
Dependent Claim
19 words
A bifocal contact lens as claimed in claim 2 in which said zones are collocated in a concentric relationship.
Claim 11
Dependent Claim
19 words
A bifocal contact lens as claimed in claim 2 in which said zones are collocated in a vertical relationship.
Claim 12
Dependent Claim
19 words
A bifocal contact lens as claimed in claim 2 in which said layer is comprised of liquid crystal material.
Claim 13
Dependent Claim
19 words
A bifocal contact lens as claimed in claim 2 which has distance and near foci produced by diffraction optics.
Claim 14
Dependent Claim
18 words
A bifocal contact lens as claimed in claim 2 which takes the form of a corneal contact lens.
Claim 15
Dependent Claim
18 words
A bifocal contact lens as claimed in claim 2 which takes the form of a scleral contact lens.
References Cited (Backward Citations)
US3794414A
Cited
US3962505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-28 | 1995-10-28 | 1996-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-28 | 1999-10-28 | 2000-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-28 | 2003-10-28 | 2004-04-28 | $7700.00 | Window Closed / Lapsed |