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:
Jun. 23, 1998
Filed:
May. 16, 1997
Rudolf Barth, Vierkirchen, DE;
Optische Werke G. Rodenstock, , DE;
Abstract
A progressive spectacle lens is described which has a convex aspherical front surface 1 and a concave aspherical back surface 2, of which at least one surface contributes to the power increase from the distance portion 3 over the progression corridor 4 to the reading portion 5. The progressive spectacle lens in accordance with the present invention is characterized by the fact that the surface 1 or the surfaces contributing to the power increase are designed in such a way that the main portion of astigmatism is transposed into an area 3 in which the power practically does not increase and by the fact that the surface astigmatism of the two surfaces 1 and 2 substantially cancel each other out in these areas 3 or 6. (See FIG. 1).