Patent US4778266A successfully refreshed from Google Patents.
US4778266A
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Progressive multifocal ophthalmic lens
Assignee: EssilorLuxottica SA
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Filing: 1986-10-08
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Granted: 1988-10-18
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Expires: 2006-10-08
Abstract
Abstract A progressive multifocal ophthalmic lens has a main meridian along at least part of which the curvature of the lens varies continuously. On each side of the main meridian the areas of aberration are symmetrical to each other. The main meridian intersects a horizontal plane through the optical center of the lens at a point which, relative to a vertical plane passing through the optical center, is spherically offset towards the nose. This offset is between 0.8 and 1.33 millimeters. The plane containing the main meridian is at an angle between 5.5 degrees and 7.5 degrees to the vertical plane. The main meridian converges towards the nose in the lower part of the lens.
Inventors
- 👤 Bernard Maitenaz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:24
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/06; G02C7/061; G02C7/063; G02C7/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
Progressive multifocal ophthalmic lens comprising a main meridian along at least part of which the curvature of the lens varies continuously and on each side of which the areas of aberration are symmetrical to each other, in which lens the main meridian intersects a horizontal plane through the optical center of the lens at a point which, relative to a vertical plane passing through the optical center, is spherically offset towards the nose by between 0.8 and 1.33 millimeters, the plane containing said main meridian is at an angle between 5.5 degrees and 7.5 degrees to the aforementioned vertical plane, and the main meridian converges towards the nose in the lower part of the lens.
Claim 2
Dependent Claim
115 words
Progressive multifocal ophthalmic lens comprising a main meridian along at least part of which the curvature of the lens varies continuously and on each side of which the areas of aberration are symmetrical to each other, in which lens the main meridian intersects a horizontal plane through the optical center of the lens at a point which, relative to a vertical plane passing through the optical center, is spherically offset towards the nose by between 0.8 and 1.33 millimeters, the plane containing said main meridian is at an angle between 5.5 degrees and 7.5 degrees to the aforementioned vertical plane, and the main meridian converges towards the nose in the lower part of the lens.
References Cited (Backward Citations)
FR1509090A
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US3785724A
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GB2020847A
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GB2058391A
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FR2495789A1
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US4580883A
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FR2533708A1
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GB2130391A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |