Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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PPG Industries Inc
Original Assignee
Pittsburgh Plate Glass Co
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Publication date
Application filed by Pittsburgh Plate Glass CofiledCriticalPittsburgh Plate Glass Co
Publication of ES213287A1publicationCriticalpatent/ES213287A1/en
A method of making a raw multifocal lens of the type incorporating an element of a refractive index having a ground and polished surface to which another element of a different refractive index, which comprises the first element with support, is melt bonded its rectified and polished surface facing upwards causes a stream of molten glass of the different refractive index to impact on said element together with a surface edge rectified and polished in such a way that the molten glass is progressively flowed through said surface and continue the flow until the entire rectified and polished surface is joined by melting glass of said different refractive index. (Machine-translation by Google Translate, not legally binding)
ES0213287A1953-01-231954-01-22A method for making multifocal lenses (Machine-translation by Google Translate, not legally binding)
ExpiredES213287A1
(en)