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
Publication of ES217990A1publicationCriticalpatent/ES217990A1/en
Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes
(AREA)
Surface Treatment Of Glass
(AREA)
Abstract
A method of melting and forming a minor element in a countersunk, polished and polished part for that purpose, located within the main element of a blank lens, characterized by the fact that it consists of pouring melted glass of a certain refractive index into the part countersunk, in order to form and melt in situ the minor element in a single operation. (Machine-translation by Google Translate, not legally binding)
ES0217990A1954-02-111954-10-22A method of funding and forming bifocal lenses (Machine-translation by Google Translate, not legally binding)
ExpiredES217990A1
(en)