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.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PPG Industries Inc
Original Assignee
Pittsburgh Plate Glass Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pittsburgh Plate Glass CofiledCriticalPittsburgh Plate Glass Co
Priority to ES0243429ApriorityCriticalpatent/ES243429A1/en
Publication of ES243429A1publicationCriticalpatent/ES243429A1/en
A method of preparing a secondary segment assembly for melting a primary element blank, of a glass of a given refractive index, to make a multifocal lens blank, said secondary segment assembly comprising a glass of different index of refraction, melted with a carrier element thereof, made of refractive index glass mentioned first method comprising the operations of enabling a carrier element having a defined surface to receive melted glass, and flowing the melted glass to said surface to form said secondary segment and melt it simultaneously to said carrier element. (Machine-translation by Google Translate, not legally binding)
ES0243429A1958-08-011958-08-01A method of preparing sets for multifocal lenses (Machine-translation by Google Translate, not legally binding)
ExpiredES243429A1
(en)