Method of filming cathode ray tubes

Claim 1

IN THE METHOD OF APPLYING A SMOOTH FILM OF ORGANIC LACQUER TO A CATHODE RAY TUBE LUMINESCENT SCREEN INCLUDING THE STEPS OF SUPPORTING THE TUBE ENVELOPE WITH THE EXPOSED SURFACE OF THE SCREEN FACING DOWNWARD, APPLYING TO THE EXPOSED SURFACE OF THE SCREEN A COATING OF A FILM-FORMING LACQUER IN AN EVAPORABLE SOLVENT, DRAINING EXCESS LACQUER DOWN THE INTERIOR SURFACE OF THE FUNNEL PORTION AND OUT OF THE DEPENDING NECK PORTION OF THE TUBE ENVELOPE, INSERTING THROUGH THE NECK A RESILIENT TRIM PIPE HAVING AN UNFLEXED CURVATURE AND LENGTH SUCH AS TO EXTEND FROM THE NECK AXIS ADJACENT THE YOKE REGION OF THE FUNNEL UPWARDLY AND RADIALLY OUTWARDLY TO A TERMINAL POSITION ADJACENT THE MARGINAL EDGE OF THE SCREEN, WASHING LACQUER FROM THE INTERIOR SURFACE OF THE ENVELOPE FUNNEL AND NECK WITH A STREAM OF WASHING LIQUID SUPPLIED THROUGH SAID TRIM PIPE, WITHDRAWING SAID TRIM PIPE FROM SAID ENVELOPE, AND DRYING SAID ENVELOPE AND THE LACQUER THEREIN, WHEREBY PORTIONS OF SAID TRIM PIPE RUB AGAINST AND SCRAPE DRAINED LACQUER FROM A CONTACT REGION INCLUDING THE INTERIOR OF SAID NECK AND YOKE AREA OF SAID FUNNEL DURING INSERTION OF SAID TRIM PIPE AND DURING WITHDRAWAL OF SAID TRIM PIPE LACQUER THEREON IS REDEPOSITED ON SAID CONTACT REGION, THE IMPROVEMENT COMPRISING WASHING SAID CONTACT REGION WITH A LACQUERREMOVING LIQUID AFTER EXCESS LACQUER HAS DRAINED OUT OF THE TUBE ENVELOPE AND BEFORE SAID TRIM PIPE IS INSERTED.