Reusable castings molds
AssigneeNovartis AG
InventorsAlice Weimin Liu, Gregory L. Herron
Life of this patent
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Abstract
The invention is directed to a reusable mold for making a contact lens and the reusable mold has at least one of the mold halves is made from an oxide glass having a Knoop Hardness less than HK 350. The invention is also directed to a method for making an optical part by single point diamond turning an oxide glass having a Knoop Hardness HK less than 350.
Claims8
A reusable mold for making a contact lens, comprising a first reusable mold half having a first mold surface in contact with a lens forming composition and a second reusable mold half having a second mold surface in contact with the lens forming composition, wherein the first reusable mold half and the second reusable mold half are configured to receive each other such that a cavity is formed between the first reusable mold surface and the second reusable mold surface, wherein the cavity defines the shape of a contact lens to be molded, wherein the lens forming composition is polymerizable and/or crosslinkable by an actinic radiation, wherein at least one of the reusable mold halves is made from an oxide glass having a Knoop Hardness (HK) less than 350.
Dependencies are inferred from the claim text.