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US 10,471,669 B2Granted
Reusable castings molds
AssigneeNovartis AG
InventorsAlice Weimin Liu, Gregory L. Herron
Life of this patent
Estimating the term…
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.
Claims7
A method for making a reusable mold for making a contact lens comprising the steps of:
- (a) selecting an oxide glass material having a Knoop Hardness less than 350 for the reusable mold for making a contact lens,
- (b) single point diamond turning the oxide glass with a neutral or negative rake angle to achieve the reusable mold having an optical quality surface.
Dependencies are inferred from the claim text.