Pre-polymer extraction using a super-cooled fluid
AssigneeBausch & Lomb Incorporated
InventorsSanjay Rastogi, Mahendra Nandu, Gary Friends
Life of this patent
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Abstract
The present invention is a process for extracting pre-polymer from a polymer lens. The process comprises the step of contacting the lens with a super-cooled solvent for a period of time sufficient to extract pre-polymer from the polymer lens.
Claims51
A process for extracting pre-polymer from a polymer lens, the process comprising the step of contacting the lens with a super-cooled solvent for a period of time sufficient to extract pre-polymer from the polymer lens.
A process for making a contact lens, the process comprising the steps of:
- providing a mold comprising an anterior mold half and a posterior mold half;
- filing the mold with a pre-polymer;
- curing the pre-polymer to form a contact lens;
- separating the anterior mold half from the posterior mold half;
- removing the contact lens from one of the anterior mold half or the posterior mold half;
- and
- contacting the contact lens with a cryogenic solvent for a period of time sufficient to extract pre-polymer from the contact lens.
A contact lens made by a process comprising the steps of:
- polymerizing a contact lens from pre-polymer material;
- and
- contacting the contact lens with a cryogenic solvent for a period of time sufficient to extract pre-polymer from the contact lens.
A process for cleaning a contact lens comprising contacting the entire surface of the contact lens with a cryogenic fluid.
A process for manufacturing a contact lens, comprising the steps of:
- forming the contact lens in a mold;
- removing the contact lens from the mold;
- and
- contacting the entire surface of the contact lens with a super-cooled fluid.
Dependencies are inferred from the claim text.