The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 2012
Filed:
Aug. 22, 2011
Jeffrey P. Krall, Mitchell, SD (US);
Hugh Mcloughlin, Dromara, GB;
Trevor Steele, Randalstown, GB;
Andrew Whale, Craigavon, GB;
Jeffrey P. Krall, Mitchell, SD (US);
Hugh McLoughlin, Dromara, GB;
Trevor Steele, Randalstown, GB;
Andrew Whale, Craigavon, GB;
Crossbows Optical Limited, Northern Ireland, IE;
Abstract
The invention generally relates to a lens and the method of manufacturing progressive addition lenses (PAL) to remove unwanted base out prism and minimize excessive convergence, comprising determining basic configuration of two major lens surfaces to provide a distance portion and near portion, wherein diopter power increases from the distance portion of the lens to the near portion; selecting an amount of prism reduction; and reducing base out prism that inherently occurs as diopter power increases by altering the configuration of the lens as a function of the amount of prism reduction to minimize any disruption of optical properties a lens while decreasing base out prism.