Patent DE3246306A1 successfully refreshed from Google Patents.
DE3246306A1
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DE
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Bifocal lens of bivisual type
Assignee: Ciba Vision GmbH
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Filing: 1982-12-14
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Granted: —
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Expires: 2002-12-14
Abstract
Abstract A bifocal lens of bivisual type, in which the reading area and the distance-vision part are divided into a plurality of concentric annular areas (F1 to F3 and N1 to N3) which are arranged alternately in the radial direction and whose area ratio, proceeding from the lens centre, in the radial direction towards the lens edge is constant in each case.
Inventors
- 👤 Dieter Dr. 6450 Hanau Kockott
- 👤 Herbert 8752 Glattbach Schwind
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-07 07:05
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/044; G02C7/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3594075A
Cited
US4162122A
Cited
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