Apparatus and method for making a video disc

Chemical etching of record patterns and the like

Disc record preparation

Drying process for video discs

High density information disc processing

Hot runner valve gate and method for eliminating unidirectional

Hot sprue valve assembly for an injection molding machine

Hot sprue valve assembly for an injection molding machine

Injection molding apparatus and process for changing mold elemen

Making a data-carrying optical disk

Manufacture of blanks for recording discs utilizing coextrusion

Manufacture of contoured records

Mechanical and fluid actuated ram for powder compacting press an

Method and apparatus for injection molding data carrying element

Method and apparatus for trimming and finishing the outer edge o

Method for defacing compact discs

Method for fabricating an information signal recorded medium of

Method for fabrication of disc substrate

Method for manufacturing disk-shaped information carriers

Method for molding a formatted substrate for an optical disk