US4636049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentric bifocal contact lens
Assignee: University Optical Products Co
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Filing: 1983-09-20
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Granted: 1987-01-13
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Expires: 2003-09-20
Abstract
Abstract In accordance with the disclosure there is provided a thin circular lens body formed of a single piece of plastic material. The body has a symmetrically curved rear surface adapted to fit centrally on the corneal surface of the eye. The lens body has a near power correction region of circular periphery in the central portion thereof, surrounded by a concentric distance power annular correction region. The near power central region has an area which is substantially equal to half the pupil area of the eye under average reading light conditions.
Inventors
- 👤 J. Warren Blaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:44
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/044; G02C7/042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A bi-focal contact lens for the cornea of an eye, comprising: a thin circular lens body formed of a single piece of plastic material; said body having a symmetrically curved rear surface adapted to fit centrally and stably on the corneal surface of the eye; said body having a near power correction region of circular periphery in the central portion thereof, surrounded by a concentric distance power annular correction region; the near power central region having an area which is substantially equal to half the pupil area of the eye under average reading light conditions.
Claim 2
Dependent Claim
95 words
A bi-focal contact lens for the cornea of an eye, comprising: a thin circular lens body formed of a single piece of plastic material; said body having a symmetrically curved rear surface adapted to fit centrally and stably on the corneal surface of the eye; said body having a near power correction region of circular periphery in the central portion thereof, surrounded by a concentric distance power annular correction region; the near power central region having an area which is substantially equal to half the pupil area of the eye under average reading light conditions.
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) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |