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EP0170141A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Manufacturing process of half-finished contact lenses

Assignee: Novartis AG
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Filing: 1985-07-13
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Granted: —
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Expires: 2005-07-13
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Abstract

Abstract Translated from German Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Kontaktlinsen-Halbfertigzeugen aus thermoplastischen Polymeren mit bereits fertig ausgebildeten Rükhflächen definierter lnnengeometrien, auf die zur Herstellung von Kontaktlinsen nur noch die den Scheitelbrechwerten entsprechenden Stirnflächengeometrien durch Drehen und Polieren aufgebracht werden müssen. Die aus den erfindungsgemäßen Rohlingen hergestellten Kontaktlinsen zeichnen sich durch Verspannungsfreiheit sowie durch eine besonders hohe Stabilität der Radien und Geometrien der Basiskurven aus. The present invention relates to a process for the production of semi-finished contact lens products made of thermoplastic polymers with already finished back surfaces of defined internal geometries, to which only the front surface geometries corresponding to the apex refractive indices have to be applied by turning and polishing to produce contact lenses. The contact lenses produced from the blanks according to the invention are characterized by freedom from tension and by a particularly high stability of the radii and geometries of the base curves.

Inventors

  • 👤 Otto-Christian Dr. Geyer
  • 👤 Frank Dr. Wingler

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-01 16:35
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; B; B29; B29C; B29C43/00; B29C43/02; B29C43/021; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29L; B29L2011/00; B29L2011/0016

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