Methods and devices to control polymerization

US6827885B2 · kind B2 · utility

Assignee

• BAUSCH & LOMB INCORPORATED · US

Inventors

• Griffith E. Altmann · Pittsford, US
• Lisa Armstrong · Webster, US
• Kevin D. Beebe · Spencerport, US
• Ian G. Cox · Honeoye Falls, US
• Horngyih Huang · Penfield, US
• Michael A. Lesczynski · Gurnee, US
• Arthur Winston Martin · Horseheads, US
• Michelle Moran · Fairport, US
• Joseph Papalia · Webster, US
• Dominic V. Ruscio · Webster, US

Key dates

• Filing date: Mar 27, 2001
• Grant date: Dec 7, 2004
• Expiry date: Oct 25, 2022

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29D11/00442
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method and mold assembly to control the polymerization of a molded article. In one embodiment, an amorphous posterior mold comprising a non-critical surface having a controlled radius of curvature is used to produce molded articles. In an alternate embodiment, ophthalmic lenses are produced using a posterior mold in which the concave surface of the non-critical surface is filled with a liquid having a similar refractive index as the mold material. In still another embodiment, a positive lens is placed at a predetermined distance adjacent to the mold assembly to alter the irradiation path to the mold assembly. In still another embodiment, a positive lens is placed within the concave surface of the posterior lens.