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US3071455A
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Polishing material
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US2923201A
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Ophthalmic lens
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US2936674A
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Method of making a multifocal ophthalmic lens
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US2796000A
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Method of making ophthalmic lens
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US2719373A
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Apparatus for etching surfaces
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US2617236A
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Lens grinder
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US2585365A
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Clutch and brake for grinding apparatus
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US2394941A
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Molding apparatus
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US2372567A
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Plating rack for optical dies
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US2333051A
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Thickness-shrinkage-controlled die assembly
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US2384202A
|
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Pressure control valve
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US2304664A
|
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Lens molding press
|
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US2373201A
|
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Automatic press system for forming resinous disks
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US2289524A
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Mold for shaping sheets of plastic material
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US2333064A
|
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Method and apparatus for form milling resinous blanks
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US2290917A
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Lens molding press
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US2302918A
|
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Method of molding blanks of predetermined mass
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US2302917A
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Method and apparatus for making flat optical surfaces
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US2304663A
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Method for preheating lens making materials
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US2305945A
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Method and apparatus for manufacture of synthetic resinous prisms
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