Process for making a light polarizing spectacle lens
Patent 5286419 Issued on February 15, 1994. Estimated Expiration Date: 
February 20, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 20, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsAssigneeApplicationNo. 839146 filed on 02/20/1992US Classes:264/1.32, Lens264/1.7, Composite or multiple layer264/2.2, Changing mold size or shape during molding or with shrinkage compensation264/2.6, Nonmechanical aftertreatment (e.g., hydration of contact lens, extraction, heat treatment, etc.)264/2.7Reshaping or treatment of an optical preformExaminersPrimary: Lowe, JamesAttorney, Agent or FirmForeign Patent References
International ClassB29D 011/00AbstractA process for making a light polarizing spectacle lens and the light polarizing spectacle lens product. The process includes drying a polarizing film at approximately 140-160° F. for approximately 2-2 hours in order to drive out any transport media from the polarizing film. The process next includes forming the dried polarizing film into a wafer, curving the wafer at a specific time and temperature range, notching the curved wafer to align with a pair of gasket protrusions, and positioning the wafer within a lens mold. The process additionally includes adding a lens resin to the lens mold containing the wafer so that the lens resin includes a pregelled monomer in a weight percent of 65-75% and curing the lens. | |
