Method of forming cathode ray tube body portion

Claim 1

THE METHOD OF FORMING A GENERALLY FRSTO-CONICAL SHAPED HOLLOW ARTICLE COMPRISING THE STEPS OF INTRODUCING A HEAT-SOFTENED CHARGE OF THERMOPLASTIC MATERIAL INTO THE BOTTOM REGION OF A HOLLOW MOLD HAVING SIDEWALLS FLARED OUTWARDLY AND UPWARDLY TOWARD THE UPPER END OF THE MOLD, SAID MOLD HAVING A SUBSTNATIALLY RECTANGULAR CROSSSECTION AT ITS UPPER END, PRESSING A PORTION OF SAID CHARGE OF THERMOPLASTIC MATERIAL INTO ENGAGEMENT WITH THE BOTTOM PORTION OF THE MOLD SIDEWALLS, THEREBY FORMING THE INTERNAL SURFACES OF SAID PRESSED CHARGE PORTION INTO GENERALLY NON-CIRCULAR FINAL CONFIGURATION ANGULARLY ALIGNED WITH THE RECTANGULAR CROSS-SECTION OF SAID MOLD UPPER END, CONTINUING THE AFORESAID PRESSING AND FORMING UNTIL THE PRESS-FORMED BOTTOM PORTION OF SAID CHARGE IS SUBSTANTIALLY RIGID WITHOUT SUBJECTING THE MOLTEN GLASS TO APPRECIABLE CENTRIFUGAL FORCES, RAPIDLY ROTATING THE MOLD ABOUT A VERTICAL AXIS THEREBY SPREADING AND MOLDING THE REMAINING STILL-WORKABLE PORTION OF SAID CHARGE OVER THE FLARING SIDEWALLS OF SAID MOLD, CONTINUING THE ROTATION OF THE MOLD UNTIL ALL PORTIONS OF SAID CHARGE ARE ESSENTIALLY RIGID, STOPPING THE ROTATION OF THE MOLD, AND REMOVING THE FORMED RIGID CHARGE FROM THE MOLD.

Claim 2

THE METHOD OF FORMING A GENERALLY FRSTO-CONICAL SHAPED HOLLOW ARTICLE COMPRISING THE STEPS OF INTRODUCING A HEAT-SOFTENED CHARGE OF THERMOPLASTIC MATERIAL INTO THE BOTTOM REGION OF A HOLLOW MOLD HAVING SIDEWALLS FLARED OUTWARDLY AND UPWARDLY TOWARD THE UPPER END OF THE MOLD, SAID MOLD HAVING A SUBSTNATIALLY RECTANGULAR CROSSSECTION AT ITS UPPER END, PRESSING A PORTION OF SAID CHARGE OF THERMOPLASTIC MATERIAL INTO ENGAGEMENT WITH THE BOTTOM PORTION OF THE MOLD SIDEWALLS, THEREBY FORMING THE INTERNAL SURFACES OF SAID PRESSED CHARGE PORTION INTO GENERALLY NON-CIRCULAR FINAL CONFIGURATION ANGULARLY ALIGNED WITH THE RECTANGULAR CROSS-SECTION OF SAID MOLD UPPER END, CONTINUING THE AFORESAID PRESSING AND FORMING UNTIL THE PRESS-FORMED BOTTOM PORTION OF SAID CHARGE IS SUBSTANTIALLY RIGID WITHOUT SUBJECTING THE MOLTEN GLASS TO APPRECIABLE CENTRIFUGAL FORCES, RAPIDLY ROTATING THE MOLD ABOUT A VERTICAL AXIS THEREBY SPREADING AND MOLDING THE REMAINING STILL-WORKABLE PORTION OF SAID CHARGE OVER THE FLARING SIDEWALLS OF SAID MOLD, CONTINUING THE ROTATION OF THE MOLD UNTIL ALL PORTIONS OF SAID CHARGE ARE ESSENTIALLY RIGID, STOPPING THE ROTATION OF THE MOLD, AND REMOVING THE FORMED RIGID CHARGE FROM THE MOLD.