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:
Aug. 11, 1992
Filed:
Apr. 19, 1991
Gerhard Kelch, Aalen, DE;
Hans Lahres, Aalen-Wasseralfingen, DE;
Helmut Wietschorke, Aalen-Wasseralfingen, DE;
Carl-Zeiss-Stiftung, Heidenheim, DE;
Abstract
The invention is directed to a multifocal surface for a multifocal lens which, for a short progression zone between a far-vision zone and near-vision zone, has a large usable width of this zone and the near-vision zone, and for which the maximum value, which the surface astigmatism reaches on the multifocal surface, is less than the 1.1 multiple of the surface increment. Such a multifocal surface is obtained when this surface is configured as twice continuously differentiable and satisfies a combination of six features which relate to the distribution of surface astigmatism and mean surface refractive power across the multifocal surface.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile