US4618228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bifocal contact lens of the bivisual type
Assignee: TITMUS EUROCON KONTAKLINSEN A GERMAN CORP GmbH
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Filing: 1983-12-09
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Granted: 1986-10-21
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Expires: 2003-12-09
Abstract
Abstract A bifocal contact lens has two, differently-focusing lens parts with a transitional zone therebetween and an arrangement to orient the zone vertically in use. The focus of the lens part then closer to user's nose is preferably adapted for reading and the other for distance. Preferably, too, the transitional area runs across the optical and physical center of at least an optical portion of the lens.
Inventors
- 👤 Heinz Baron
- 👤 Peter Hoefer
- 👤 Herbert Schwind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:46
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/042; G02C7/045; G02C7/048
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
A bifocal contact lens of the bivisual (simultaneous-vision) type, comprising: a reading-focusing lens part (N) and a distance-focusing lens part (F) of different refractive powers and a transitional area (T) therebetween, and means for stabilizing of the lens on the eye in such a way that the transitional area (T) runs from the lower to the upper part of the lens with the reading-focusing lens part (N) located nasally and the distance-focusing lens part (F) located temporally when the lens is in situ.
Claim 2
Dependent Claim
83 words
A bifocal contact lens of the bivisual (simultaneous-vision) type, comprising: a reading-focusing lens part (N) and a distance-focusing lens part (F) of different refractive powers and a transitional area (T) therebetween, and means for stabilizing of the lens on the eye in such a way that the transitional area (T) runs from the lower to the upper part of the lens with the reading-focusing lens part (N) located nasally and the distance-focusing lens part (F) located temporally when the lens is in situ.
Claim 3
Dependent Claim
27 words
The lens according to claim 1, wherein the transitional area (T) divides the pupil of the eye into substantially equal parts when the lens is in situ.
Claim 4
Dependent Claim
19 words
The lens according to claim 2, wherein the transitional area (T) runs through the geometric center of the lens.
Claim 5
Dependent Claim
19 words
The lens according to claim 2, wherein the transitional area (T) coincides with the vertical meridian of the lens.
References Cited (Backward Citations)
FR2340560A1
Cited
GB2041557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |